1961AJ 66. . 1 69L / was intendedsimplytopublish theseasanadditionto emission-line objectsintheareas notbeforecovered.It obtained. Thisprogramrevealed about100new 30 minandspectralwidths ofabout0.2mmwere No. 25Aredfilterwereexposed.Exposuretimes emission-line objects103a-EplateswithaWratten not narrowenoughtoreachfaintemission-lineobjects. nebulae. Diffusenebulaewereomittedexceptforafew telescope andobjectiveprism.ForthediscoveryofH Hu spheres.TheinstrumentusedwastheADH nebular lines.Thesecondpapergaveacataloguewhich outlying regionsoftheCloud,againusingADH In 1956-57aprogramwascompletedcoveringthe to beplanetarynebulaeandnineprobably contained allthepoint-sourceemissionobjectsknown been publishedbythewriterin1955and1956.The THE ASTRONOMICALJOURNALVOLUME66,NUMBER4MAY,1961 dispersion of240A/mmatH. telescope with3°10objectiveprismwhichgivesa at thattime.Ofthe97objectslisted,20wereconsidered first paperincludedonlyobjectscontainingtheNiN^ Two papersonemission-lineobjectsintheCloudhave ment usedwasthered-correctedMt.Wilson10-inch in 1933.Thislistbroughtthenumberofsuchobjectsto at theLamont-HusseyObservatoryinBloemfontein. camera witha15°objectiveprismtemporarilysited light werereportedbyHenizeandMillerin1951. THE firstlistofemission-lineobjectsintheSmall of theSmallCloudwascovered.Also,spectrawere catalogue contained65emission-linestars.Theinstru- Resulting fromthissurveyHenizepublishedacatalogue considered tobegaseousnebulae. of Haemission-linestarsandnebulaein1956.This 13, twoofwhichareOstarsand11were a y In previoussurveysbythewriteronlymainbody Preliminary resultsofasurveytheCloudinH a © American Astronomical Society • Provided by theNASA Astrophysics Data System Magellanic CloudwaspublishedbyMissCannon positions havebeenmeasured.Thirtyoftheemission-lineobjectsareconsideredtobeplanetarynebulae arm andouttothewingwheretheyend. The emission-linestarsarefoundfairlyuniformlythroughoutthemainbodyofCloud,alongtidal The bluestemission-linestarsappeartobeinthedensestpartofCloud.planetariesaremostnumer- stars ofnegativeb-r,—2.9and+0.82forpositiveb-r—2.7+0.70planetarynebulae. red giantsandsupergiants.Themeanabsolutemagnitudesb-rcolorsare—4.3—0.69for ous inthesouthwest.Theboundariesforemission-lineobjectsgeneralandclustersareverysimilar. and 19probablyplanetaries.Mostoftheremainderappeartobeearlytypestarswithasmallmixture filter usingtheADHtelescopeandobjectiveprism.Blueredphotographicmagnitudesapproximate NEW OBSERVATIONALMATERIAL The cataloguecontains593point-sourceemission-lineobjectsfoundmainlyon103a-Eplateswithred A NewCatalogueofEmission-LineStarsandPlanetaryNebulae INTRODUCTION in theSmallMagellanicCloud Armagh Observatory,NorthIreland (Received January25,1961) E. M.Lindsay 169 hm m m in planetarynebulae. The photographicmagnitudes ofthestarsin With somuchnewmaterialitwasdecidedtopublish some 400newobjectsinthisalreadycoveredregion. made onthemainbodyofCloudduringaperiod one of5-minandfour10-min exposures,wereused. where thereareemissionlinesinadditiontoe.g., added littleinformationtothespectraltypes,except covered by103a-Oblue-sensitiveprismplates.Dueto a newcatalogueofemission-lineobjects. excellent focusandoptimumspectrumwidthyielded exceptionally steadyseeingandtransparencywith in theSMC.Consequently,photographicmagni- for allemission-lineobjects.Theobservationalprogram the faintnessofmostobjectstheseplateshave extrapolation ofthecalibration curveswasnecessary. before thepublicationofArp’s(1958a)sequence was completedandmanyofthemeasurementsmade the cataloguementionedabove.A30-minexposure Five directplatescenteredat R.A.=l40,b=—73?7, are used.Fortheveryfainteststarsasmallamountof this, tostarô(wg=17.28),theHarvardmagnitudes to each.King’smagnitudesextendstaræ.Beyond get goodagreementwithKingovertherangecommon by GascoigneandKron.Ifweapplyameancorrection common toArpandGascoigneKron.Whilethe I (1940).NineofKing’sstarsarecommontothe ments madebyKing(1951)onthestarsofsequence of —0ltothesequenceGascoigneandKronwe Arp findsfortheVmagnitudes,A—GK=—0land difference K—GK=—0+11.Onlythreestarsare sequence ofGascoigneandKron(1954)giveamean tudes arebased,asbefore,onphotoelectricmeasure- error intheC12andD2regionsusedfortransference suggests thissystematicdifferencemayarisefroman two photometricsystemsarenotstrictlycomparable, P In additiontothe103a-Eplates,allfieldshavebeen It wasintendedtoprovideblueandredmagnitudes MAGNITUDES 1961AJ 66. . 1 69L hm a hm m m m m m m catalogue uptonumber547arebasedonthemagnitudes of starssequenceImeasuredontheseplates.To obtain themagnitudesofstarsfurthereast 170 E.M.LINDSAY were calibratedontheseplatesandtwoothersof sequence III(l05,—73?9)oftheCloud(Nail1940) reference. Onlytwoplatesof39-minexposureeach Finally, tomeasurethemagnitudesofafewstarsin were availabletoestablishthissequence. Small Cloudwing,anewsequencewassetupatR.A. 10-minute exposureusingthestarsofsequenceI. of sequenceI.Thesehavebeenusedtoestablishb-r magnitudes ofthestarsg—x,omittingsandn, no greatincreaseinskybackgroundduetofainterstars colors oftheemission-lineobjects.Themajorityred is farfromsointheClouditself.Consequently,using within theareaoccupiedbysequencestars.This outside themainbodyofCloud.Withincreasing plate inmanycasesgavemuchbrightermagnitudes magnitudes weremeasuredoneachoffourplatesusing exposure times,atthisgalacticlatitudetherewillbe exposure time.ThestarsktobusedinsequenceIare times theagreementwasexcellent.Itsuspected King’s sequencedirectly.Theplateswere103a-Ewith systematic differencescouldarisebetweenplatesof an irisdiaphragmphotometer,itwouldbeexpectedthat that thiswasaskybackground”effectdependingon than the10-minandsecond30-minplates;some- between theredplates.The90-minandone30-min a redfilter,oneof90-min,two30-minand being measuredchangedmuch.Now,the90-minplate different exposuretimesiftheskybackgroundof sequence starschangedlittlewhilethatofthe = l55,5—74?6usingthestarsofsequenceIIIas particularly goodone.The30-minplatewhichagreed parable tothe10-minexposure.Thesevaryingqualities with the10-minplatewasnotasgoodandcom- the samelimitingmagnitude;this30-minplatewasa and the30-minplatewhichagreedwithithadabout plates whichcanbeconsideredaslongexposureand of 103a-Eplatesarewellknown,theage 10-min exposure. being animportantfactor.Wethushavetwopairsof long-exposure plates. magnitude ofthestarsin these groupsonthetwo gave valuesof—062, 80 (inthedensestpart long-exposure platesminusshort-exposureplates,was short exposure. of theCloud),—063and —045.Correctionsof of theCloudgaveanegativedifference,meanbeing the Clouditwasfoundthatmeandifference, these amounts,withsignsreversed, wereappliedtothe other hand,eachof254starswithinthemainbody Cloud fromwesttoeastaccording toskybackground +002, adifferencewhichisofnosignificance.Onthe — 063.Abroadsubdivisionintogroupsacrossthe King hasobtained,butnotpublished,photo-red There weresometimeslargemagnitudedifferences For 117starscompletelyoutsidethemainbodyof © American Astronomical Society • Provided by theNASA Astrophysics Data System m m m Aw -0.050.130.200.270.40 lesser degree,betweenthefour10-minuteexposureblue measured ontwo30-minuteexposureplates;therest or soofthecatalogue,subsidiaryredsequenceswere Center distance(cm)7.58.59.510.511.5 important thiscanbeasthestarbecomesfainter. 024, ,andl. plates andtheone5-minuteexposure.Thecorrections set upasforthebluemagnitudes.Thelast25starswere published byArp(1960).Theseclearlyshowhow corrections totheredmagnitudesabove,are016, systematic differencesbetweenanyofthese. on three30-minuteexposureplates.Therewereno derived magnitudesonskybackgroundhavebeen to beappliedtheformer,corresponding from eyeestimatesmadethroughabinocularmicro- had beenexposedonHarvardStandardRegionE6, used arecircularwithanexposeddiameterof25.5cm. instead ofbyeye.TheyaregiveninTableI.Theplates rated indeclinationsothatthesequencesweresituated scope usingagradedscaleofstarimages.Twoplates measurements werewiththeirisdiaphragmphotometer The correctionsusedhereareslightlydifferentsince distances fromthecentergaverequiredcorrections. curves forthecentersequenceandthoseatdifferent the plates.Thedifferencesbetweencalibration at varyingdistancesbetweenthecentersandedgesof each platecontainingsevenexposuresof30secsepa- In mostcasesinthepresentpapercorrectionstobe applied weresmallandrarelyexceeded02. line objectshavebeenmeasuredbysuperimposing plates ongraphpaperwhichstarsofknownpositions unknown positionweretransferredtorightascensions were plotted.Thexandycoordinatesofstars measured. Thereshouldbeno ambiguityaboutidentifi- and insomecasesshouldsufficeforidentification.For useful fortelescopesettingandapproximatepositions coordinates doesnotalways followtheorderof of theHarvardsystem(Leavitt 1957)havebeen stars innottoocrowdedregionsXandYcoordinates and declinations.Theseroughmeasurementscanbe due partlytotherapidconvergence ofrightascension cation ofallsuchstars.The orderoftheXandY catalogue, thatis,theorder of rightascension.Thisis To obtaintheredmagnitudesoflast100stars The sameskybackgroundeffectwasfound,buttoa Some quantitativevaluesofthedependence Values ofthesehavebeenpublishedbythewriter The rightascensionsanddeclinationsofallemission- CORRECTIONS FORDISTANCEFROMPLATECENTER Table I.DistancecorrectionsonADHplates. IDENTIFICATION 1961AJ 66. . 1 69L m 0l inthelattercouldconsiderablychangenumber could nototherwisebefoundwithcertainty. coordinates onaHarvardBruceplateprint.Theonly high itisnotpossibleaccuratelytomeasureXandY accurate rightascensionmeasurements;achangeof probably belongsto47TucanaethantheCloud. previous catalogue.Number1hasbeenomitted;it column givesaroughindicationoftheintensity,relative magnitude. Themodulus(m—4T)=18.7derivedby safe methodofidentificationisbycharts,andon circles atthishighdeclination,partlytotheless Numbers inparenthesesarethosethewriter’s are givenforthosestarsnotmarkedonFigs.1-4. de Vaucouleurs(1955)hasbeenretained.Theseventh tude, redcolorindex{b-rphotographic)andabsolute ascension anddeclination(1900),photographicmagni- Figs. 1-4aremarkedthosestarswhichitwasfelt of astarinthecatalogue.Wheredensitiesare seems tobeavariable,possiblylongperiod,andmore to theplatebackground,ofrangingfromveryfaint (vf) throughfaint(f),moderately(mf),moderate (vs). IntheremarkscolumnXandYcoordinates (m), moderatelystrong(ms),(s)tovery Successive columnsgivethecataloguenumber,right © American Astronomical Society •Provided bythe NASAAstrophysics Data System the SMCmarkedon103a-O,30- minute exposureADHplates. Fig. 1.Emission-lineobjectsin THE CATALOGUE EMISSION-LINE OBJECTSINSMC171 x64 :: ;:x we wmm-• V./T -AsA.\‘ ; Aa .Aa:C;'•a'a Lvfi; /:A.A.ÄvA .TA: • ..,/A./;•-■.n<'A' a 2W -I®.x-r. ,A* V«- : *,•xpAAbiäA'»iTj-,'■'f-'-M'',, 2,2:; V; A■j-...ya/A;.;'-.\’TAv : : : 1oo^ AA'-aa-;;--8,, . ' .-’A.'•“Ax•.«L’-A.;•f ^ ,,a;V ; ^T: f ' : .'\ m~ ->°„y;*>m*y J-A,' V- :•«AA2 IfÔ -155As*"* ' Nss X4 ^ H9'’a is possiblyemissioninNo.34.Thenumber Henize’s numbers1,2,5,13,14,26,27,30,31,33,34, from theanalysis. giving atotalof597objects,buthavebeenexcluded point sources,theHusphereshavealsobeenlisted, Numbers 53,63,72,and74ofthefirstcataloguedonot it wasoverlooked;S15,wherethereseemstobe Table 4werepassedover.TheseareS10,which 57 wasconsideredbyHenize“doubtful”andinnumber in thewriter’sclustercatalogue(Lindsay1958).There 37, 40,41,45,52,57,and60.Number26iscluster56 in thistableof65objectsthereare18forwhichno seem sufficientlycertaintobeincluded.Althoughnot of thecontinuumandthuseasytomiss;S22,where definitely hasemission,anditisdifficulttoseehow stars HD6884and7583.Threeobjectsinhis 60 “perhapsdoubtful.”Numbers52and57aretheB emission canbefoundonArmaghplates.Theseare the emission-linestarinHenize’sTable4.Surprisingly, ing thecataloguetheywereinsertedasnumbers107a, have emission.Thesewerenoticedaftertheplateshad the northwesternoftwooverlappingspectraseemsto emission butwheretheintensityisaboutequaltothat been numberedandtoavoidremarkingrenumber- 200a, and280a. ; ^■i--..*'‘f : The letterSfollowedbyanumberistheof "'CP- .:.A' a._: : 'N 4\ ^0 w 66 .f *' 52—-' '»X if 1961AJ 66. . 1 69L continuum—a lineifthespectrum wasbroadened,a planetary nebulaeandnine asprobablyplanetary. Wratten 25Aredfilterasisolated emissionwithout Each ofthe20appearedon 103a-Eprismplateswith refers totheClusternumberinwriter’scatalogue emission-line stars.TheletterCfollowedbyanumber of doubtfulnatureandtheremaining16areordinary four arecertainlyandtwopossiblyHuspheres(the data inthecataloguerefertocentralstars),twoare planetary nebulae(denotedbyP),sixarenebulous no Armaghplateoriginallywastakenasfarsouth stars onredsensitivebutnotblueplates, this. Thirty-sixoftheseareplanetaryorprobably identified withobjectsinthecatalogue.Theoutlying southern object(8=—76°.3)wasaddedasnumber445a; nebulae intheSmallCloud.Sixty-sixofthesehavebeen Henize’s Table5whichcontainshis117emission (Lindsay 1958). 172 © American Astronomical Society •Provided bythe NASAAstrophysics Data System In thefirstcatalogue20 objects werelistedas The letterNfollowedbyanumberisthein PLANETARY NEBULAE E. M.LINDSAY 7 catalogue numberandHenize’s number,respectively. No. 536(NiN2,Hß).Data for these30objectsare collected inTableII,thefirst twocolumnsgivingthe No. 83(NN);134 No.239 nebular lines.Theyareasfollows:No.16(i\ii\V); Radcliffe reflector.Inaddition,sevennewobjectsshow Thackeray (privatecommunication)withthe74-inch plate, thespectrumisvariableasshownbyfurther objective prismplatesandaslitspectrogramtakenby dropped. AlthoughN1N2seemtobepresentonone follows: No.60(Wi+W);142(Ni+AT,; new materialthreeofthesedoshowthenebularlinesas (NjN^Hß) ;No.289(NLW,#^,^) ;No.343(AW) the presenceofN1N2linesonblueplates.With characteristics asthe20butwithoutcertaintyof objects classifiedasprobablyplanetaryhadthesame red colorindex.On103a-OprismplatestheN\Nand 12 196 (NrN^Hß). sometimes othernebularlinesarepresent.Thenine associated withnebulosityandeachhadapositive round spotifthespectrumwasunwidened.None 2 2 2 One oftheprobableplanetaries(No.250)hasbeen ADH plates. jects intheSMCmarkedon 103a-O, 30-minuteexposure Fig. 2.Emission-lineob- 1961AJ 66. . 1 69L nebulosities. Noobviousnebulosityispresentbutitnot No. 537.BothofthesearelistedinHarvardAnn.60as possible tosaywithcertaintythatthereisnonebulosity omitted fromTableII.TheyareNo.481(IC1644)and mediately recognizable.Thisisalsotruegenerallyin H emissionhasadistinctiveappearanceandisim- sidered dependable.NeverthelessIC1644isabright associated withthem.Themagnitudesarenotcon- requirements forregardingsuch objectsasplanetaries emission linedoesnotstand outsoclearly.Thethree objects areoutsidethemainbodyofCloud.The ently ofblueprismplatesseemsreasonablysafeifthe object andcannotbemuchdifferentfromM=—8. planetary nebulaeshoweither noorappreciable cases; duetothedensestellar backgroundtheH the mainbodyofCloud,buttherearedoubtful are: littleornocontinuum (allobjectsclassifiedas a VK a Two well-knownobjectsrichinnebularlinesare Classifying objectsasplanetarynebulaeindepend- minute exposureADHplates. the SMCmarkedon103a-O,30- © American Astronomical Society •Provided bythe NASAAstrophysics Data System Fig. 3.Emission-lineobjectsin EMISSION-LINE OBJECTSINSMC nebulous regions. parsecs atthedistanceof MagellanicClouds).On in thepresentworkmustbeonatentativebasis.There nebulosity. Thelatterrequirementisthedifficultone. may beanumberofsmalldiffusenebulaewhose the otherhand,thereisalso thedangerofaselection diameters arebelowtheresolvingpowerofADH cation ofplanetaries,andthatobjectssoclassified are necessarybutnotsufficienttoestablishidentifi- tude andaspuriousb-r. on adenseskybackground.Photometermeasuresofan It issometimesimpossibletodetectitsuperimposed stars do),positiveô-r,andtheabsenceofdiffuse are simplyprojectedonsome ofthemoreextensive effect, namelytheexclusion oftrueplanetarieswhich telescope (aboutlO",correspondingroughlytothree object embeddedinitwouldgiveabrighterredmagni- continuum whileallthoseclassifiedasemission-line It isrealized,however,thatthesethreeconditions 173 1961AJ 66. . 1 69L identification. Ifitis,asonewouldexpectfromthe neighboring spectrum.Thereissomedoubtabout plates theHemissionispartiallyoverlappedbya No. 254,listedasastellarobjectbyHenize.OnArmagh diffuse nebulae.Thereissomethingambiguousabout N1N2 doesnotconclusivelyseparateplanetariesfrom blue plates.Itis,ofcourse,truethatthepresence however thatNos.120,275,305,516,andespecially 254 couldbebrightenoughtorevealthemselveson on 13newlyfoundsimilarobjects.Onecouldexpect probable planetarynebulaeofthefirstcatalogueand a 174 No. No. 107 Fig. 4.Emission-lineobjectsintheSMCmarkedon103a-O, 49 41 95 56 Table IIIcontainsdataonthefiveremaining 43 33 32 62 45 83 60 14 16 © American Astronomical Society •Provided bythe NASAAstrophysics Data System 2 1 N26 N6 N4 N2 N18 Nil N9 N7 N5 N10 N1 N8 H FI 30-minute exposureADHplates. -2.3 -1.7 4+ 3.9 2.2 4.3 3.5 4.7 2.3 0.7 2.4 2.4 2.4 2.1 1.8 1.9 1.6 +0.49 +0.3 b-r 0.17 0.84 b-r 0.87 0.57 0.38 0.54 0.48 0.7 0.58 0.58 1.05 1.14 1.20 1.2 Table III.ProbablyplanetarynebulaeintheSMC. No. No. 302 254 275 138 120 115 142 132 179 196 184 137 134 191 174 144 Table II.PlanetarynebulaeintheSMC. E. M.LINDSAY N42 N31 N29 N47 N34 N33 N55 N46 N43 N32 N40 S19 N44 N38 H H -2.4 -3.4 absolute magnitudeslessthan—2.5.Koelbloed(1956) planetaries ofM31,foundfivewith47rangingfrom 3.8 expect anincreaseinthenumberofplanetarieswith planetaries. Baade(1955),searchingforthebrighter 3.2 4.0 2.3 3.0 2.4 3.8 3.6 in magnitudebetweencentralstarandnebulagives 2.6 3.7 a meanabsolutemagnitudeof—1.8forgalactic 2.7 absolute magnitudeofaplanetaryandthedifference 2.7 2.7 but havenotbeenverified.Neverthelessitwouldseem 2.0 — 2.0to—2.5,givingTf=—2.2.Onewouldtherefore tude effect.Bierman’s(1957)relationbetweenthe A fewsuspectshavebeennotedatthelimitofoneplate that themaximumfrequencybetweeni7—2.0and together wegetikfg=—2.7,b-r=+0.70. — 2.4isprobablyrealandnotduetoalimitingmagni- pg b-r colorsare+0.72and+0.67.Takingthetwotables nebulae byHenize;inTableIIIhalfoftheobjectsare and III,respectively,are—3.0—2.3;themean so listed.ThemeanabsolutemagnitudesforTablesII from sequenceI. tudes ofTablesIIandIIIisshowninTableIV. were measuredbytransferringablueandredsequence from sequenceIII.Onlyoneblueandredplate measured onasingleplatebytransferringsequence were availableforthemagnitudesofNo.289andthese pg blue magnitudesoftheseareapproximate,being pg brighter thantheobjectlistedhere. intensity of77«,anadjoiningmuchfainterstar,its able. InHenize’slistS19isabouttwomagnitudes absence frombluespectrumplateswouldbeunderstand- P No doubttherearefainterplanetariestobefound. All butfourobjectsinTableIIarelistedasgaseous The frequencydistributionoftheabsolutemagni- No redplatewastakenonNos.358and445a.The + 1.01 +0.34 b-r b-r 0.36 0.42 0.71 0.37 0.97 0.75 0.80 0.69 0.42 0.75 0.15 1.28 1.09 1.65 No. No. 357 333 323 305 517 445a 430 372 347 339 321 536 343 335 358 532 239 289 N61 N71 N70 N87 N68 N64 N54 a N86 N73 N67 N60 H H -2.9 -2.8 2.9 4.6 2.0 2.0 2.0 3.6 1.7 2.9 2.8 3.0 4.4 2.6 2.0 1.6 2.7 1.2 +0.02 +0.30 b-r b-r 0.72 0.41 0.87 0.83 0.84 0.52 0.88 0.20 0.66 0.84 0.13 0.9 1.31 1.43 1961AJ 66. . 1 69L h plotted. found byShapley(1940)atapproximately2—75° The termtidalisalsousedwithoutprejudiceastoits convenience indescribingtheseregionsoftheCloud. connecting linkbetweenthemainbodyofCloud while “tidalarm,”referredtobelow,isusedforthe considered tobecertainlyplanetarynebulaeare somewhat moremarkedifonlythoseobjectswhichare Table IIistakenaloneorIIIincluded.It for thesouthorsouthwest.Althoughthereareafew present result. two distinctphenomena;thedifferentiationisfor outlying objectsnonehasbeenfoundinornearthe for theintervalM—1to—2.5,thusagreeingwith and thewing.Itisnottherebyimpliedthatthereare Cloud wing.Thisdistributionisthesamewhether almost absenteastofNGC346.Thereisapreference and isshowninFig.5.Therearefewertheeastern magnitude, foundnoimportantincreaseinthenumber than inthewesternpartofCloud.Infacttheyare Radcliffe 74-inchreflectorandreachingtothe18th searching forplanetariesintheSmallCloudwith vg The “wing”referstotheextensionofSmallCloud The distributionofplanetarynebulaeisinteresting © American Astronomical Society •Provided bythe NASAAstrophysics Data System posure MFplate. nebulae intheSMC(TablesIIand III) markedona60-minuteex- Fig. 5.Distributionofplanetary EMISSION-LINE OBJECTSINSMC interpretation andthatofsimilarphenomenaoffersa challenge totheoreticalworkers. being excluded. origin. AsdeVaucouleurshaspointedout(1954),its tration ofb-rcolorswithinnarrowlimitsistobe colors aregiveninTableV.Thetablecontains545 doubt ofspectralclassB.Sixty-twopercentarewithin expected sincemostoftheemission-linestarsareno to —7.5,65%areincludedintheinterval—3.5 emission-line stars,planetarynebulaeandHuspheres — 4.9and83%between—3.0—5.4.Theconcen- 0.5-0.9 12.0-2.4153.5-3.96 1.5-1.9 53.0-3.464.5-4.92 1.0-1.4 22.5-2.994.0-4.44 Although theabsolutemagnitudesrangefrom—0.6 The distributionofabsolutemagnitudesandb-r — TfpgNo..Mpg Table IV.Frequencyofabsolutemagnitudes ABSOLUTE MAGNITUDESANDb-TCOLORS planetary nebulae(TablesIIandIII). 175 1961AJ 66. . 1 69L nebulae areô-f=+0.70andM=—2.7,bothbeing much thesameasredstars. 65 starsofpositivecolorsare+0.82and—2.9,their the bluestars.Themeanvaluesforplanetary mean absolutemagnitudesbeingthus1.4fainterthan magnitude of—4.3.Thecorrespondingvaluesthe colors haveameanb-rof—0.69andabsolute and —1.4.Thereare,however,afewveryredgiant emission-line objects.The480starswithnegative the b-rlimit—0.5,—0.9andnearly90%between0.0 176 © American Astronomical Society • Provided by theNASA Astrophysics Data System Fig. 6.Relationbetweenabsolute magnitudesand(b-r) -M\ 0.5-0.9 6.5- 6.9 3.5- 3.9 6.0- 6.4 5.5- 5.9 4.5- 4.9 4.0- 4. 3.0- 3.4 2.0- 2.4 5.0- 5.4 2.5- 2.9 7.5- 7.9 7.0- 7.4 1.0- 1.4 1.5- 1.9 Xb-r \b-r colors foremission-line starsintheSMC. 1.4-1.0 0.9-0.50.4-0.00.1-0.50.6-1.01.1-1.51.6-2.02.1-2.52.6-3.0 67 13 22 18 — + 4 6 4 Table V.Distributionofabsolutemagnitudesandb-rcolorsemission-linestars. 337 112 29 10 78 28 68 2 5 3 1 1 76 15 12 15 15 4 7 2 5 1 E. M.LINDSAY 27 4 3 1 5 5 1 7 1 preferential regionforbrighter absolutemagnitude further subdivisionofthe central areassuggestsa negative b-r.Inthemainbody ofthecloudonly5% line starsthanblue,only47% ofthetotalhavinga and bluerstars. magnitudes arefairlyconstant overallregions,although part. Oneithersideofthisandabovebelowitthe region ofmaximumbluenessinthecenteranddensest wing. represent objectsscatteredoverafairlylargearea;the 451 starsarelefttobeincludedinthedistribution. were takenoverareaswheretheb-rcolorsreason- in colorindiceswaslargeandthepresenceofmany population oftheSmallCloud.Theretoo,spread Large CloudandbyArp(1958b)forthegeneralfield the emission-linestarsarered. Theaverageabsolute wing, andnotfoundelsewhere,aremoreredemission- marked thefartherdistancefrommainbody. by X9300-17700andY5700-14100.Thethreecircles Of these,353areinthemainbodyofCloudbounded ably constant.Byomittingplanetarynebulae,Hu ordinates areXandYHarvardnumbers.Averages average b-ris—0.53.Furthereast,towardsandinthe In thetidalarminneighborhoodofNGC456 stars arelessblueand,broadlyspeaking,thisismore southeast circleincludesobjectsuptoandintheCloud spheres, positiveb-rcolors,andafewisolatedobjects, the CloudandvaluesareshowninFig.7.Co- stars ofnegativeb-rwereaveragedatdifferentparts stars bluerthan—0.5indicatedanegligibleamountof by NailandShapley(1953)infiveconstellationsofthe the variationofemissionintensity. should bequitepronouncedsinceitispartlyaresultof spread inredcolorindicesforanyabsolutemagnitude space absorption.WithHemission-lineobjectsthe colors withafewgiantsandsupergiantswasalsofound Cloud wing,itaveragesaslow—0.41.Hereinthe against b-r.Thisassociationofstarsnegativeb-r a 14 Passing westtoeastacrosstheCloudthereisa The valuesofb-rcolorandabsolutemagnitudefor Figure 6givestheplotofabsolutemagnitudes 17 545 148 102 105 24 47 53 26 12 12 3 6 3 2 1 1 1961AJ 66. . 1 69L magnitudes orundercorrectionoftheblue but notall,oftheresults. have beenfoundphotoelectricallybyHogg(1955) line starsmakesapronounceddifferenceinthewingof negative b-rcolorsareconsidered;inthelowercurve color acrossasectionoftheCloudbetweenF=6300 the changeincolorawayfromcentralregions is —73?7,whichsomewhatsouthofHogg’ssection. and F=8100.Intheuppercurve(a)onlystarswith and byElsässer(1958).Figure8showsthechangein integrated lightoftheCloud,andthusprobablytoa portion asElsässer’sandtheauthor’s.Bearinginmind His measurementsdonotreachsofarfromthecentral the Cloud. interpretation isdifferentstagesofevolution.Itnot wing. fainter meanabsolutemagnitude,andthedangerof of about1mag.betweenthecentralportionand obtained acolorindexof+0.87fortheoutermostarea geneous sampleofemission-linestars,thethreesets drawing conclusionsaboutCloudcolorsfromahetero- that thedataofHoggandElsässerrelateto improbable thatthewinginparticularrepresentsan formation. red stars.Therearethustheindicationsofamore clusters hereandtheyarenotconspicuous;thereisno these colorchangesasduetoabsorption.Amorelikely of thecloud.Theemission-linestarsindicateadifference and changingcoloraswedepartfromit.Elsässer data agreeregardingthebluenessofcentralportion (or both)forskybackgroundcouldaccountsome, nearly purePopulationIIandthecessationofstar or redplates;thereseemstobealargeproportionof extreme conditionintheSMC.Thereareonlyafew evidence ofnebulosityonlong-exposureADHblue tudes (eachnegative)intheSMC andnumberofstarsused. Ordinates andabscissaeareX Fcoordinates. (b) allemission-linestars.Theinclusionofemission- Fig. 7.Distributionofmean(b-r) colorsandabsolutemagni- It isclear,ofcourse,thatovercorrectionthered The bluenessinthecentralportionsofSMCand The approximatedeclinationofthesectioninFig.8 As Hoggpointedout,itisdifficulttoaccountfor © American Astronomical Society • Provided by theNASA Astrophysics Data System EMISSION-LINE OBJECTSINSMC hm/ ô=—73?5 approximately.Rightascensionsarealsoapproximate. The numberofstarsisgiven,(a)Uppercurve:onlywith negative b-rcolors,(b)Lowercurve:allemission-linestars. but twodegreessouthof47Tucanae.Fromthere,a the emission-linestars.Theyarefirstfoundjusteast bulk ofemission-linestarsaredistributedfairlyevenly small beltleadstothemainbodyofCloud.The throughout themainbodyalthoughthereisasmall of NGC419(attheNEedgeabove)thaninany proportion ofolderSMCstarsintheneighborhood clusters. ItisnoteworthythatArp(1959)findsalarger area ofavoidancebetweenX(13500-15900)and has almostbutnotquitebroken awayfromthetidal of earlierstarformation.Themainbodyisconnected this southeastportionoftheCloudseemstobearegion other fieldhehasinvestigated.Aspointedout, given byitsoutlyingclusters. arm. Thereisadefinitegap betweentheemission-line around a=l405=—73°40suggestingthatthewing so farasemission-linestarsandclustersshow,isweak tidal arm.Theyendinthewing.Thissupports to thewingbyabridgeofemission-linestarsalong outlying emission-lineobjects isidenticalwiththat stars oftheSmallandLarge Clouds. separate system.Thelinkbetweenthetwo,however, evidence fromthedistributionofclusters(Lindsay F (6300-8700).Thissmallregionisalsodevoidof 1958) thatthewingbelongstoCloudandisnota Fig. 8.Changein(b-r)coloracrossasectionofthecloudat There isnothingunexpectedinthedistributionof The extentoftheSmallCloud asshownbythe THE DISTRIBUTIONOFEMISSION-LINESTARS 177 O'! 178 E. M. LINDSAY

CATALOGUE OF EMISSION OBJECTS

No. R.A. Dec. b-r 4fPg Remarks 1 0h14m0 -74°21.5 17.00 +0.3 -1.7 3816 5220 P 2 19.5 74 11.3 16.94 + 1.05 1.8 m 5022 6042 NI, P 3 22.5 74 45.4 16.34 ±0.0 2.4 vf 6000 4104 4 23.8 74 56.8 14.12 -0.69 4.6 m 6420 3444 5 24.3 74 45.4 13.77 -0.24 4.9 m 6432 4134 6 24.7 73 09.3 17.8 + 1.7 0.9 mf 5862 9918 7 24.7 73 47.5 17.3 + 1.4 1.4 f 6120 7620 8 25.3 73 41.5 16.36 +0.54 2.3 f 6258 7998 9 25.9 74 10.1 16.87 + 1.17 1.9 mf 6594 6258 10 26.8 73 48.1 14.35 -1.07 4.4 m 6678 7596 11 27.2 73 50.5 15.47 -0.55 3.2 f 6816 7470 12 27.7 74 20.4 14.32 4.4 7056 5676) Uncertain whether Nos. 12 and 13 are 13 27.8 74 20.5 15.94 +0.33 2.8 7068 5676/really emission objects. They are con- nected by a bar of nebulosity correspond- ing to N3 14 28.6 72 15.7 16.39 +0.49 2.3 6552 13260 (2), N2, P 15 28.6 74 12.7 15.93 +0.93 2.8 7248 6180 16 30.3 73 45.3 17.06 +0.70 1.6 mf 7536 7872 N4, P 17 31.0 74 14.7 15.50 -0.73 3.2 f 7866 6174 18 31.1 74 10.3 15.01 -0.68 3.7 mf 7848 6402 19 31.8 73 54.9 16.42 +0.27 2.3 mf 7938 7380 20 32.6 73 46.0 14.36 -0.71 4.3 m 8130 7938 21 32.8 74 06.8 15.09 -0.71 3.6 mf 8262 6690 22 33.8 74 19.6 14.57 -0.96 4.1 vf 8586 5922 23 34.2 74 11.8 14.44 -1.00 4.3 m 8634 6408 24 34.2 74 18.7 15.04 -0.85 3.7 mf 8664 6012 25 34.6 73 56.2 14.27 -0.92 4.4 mf 8670 7344 26 34.7 73 45.6 14.28 -0.86 4.4 m 8646 7980 27 36.6 72 31.1 14.78 -0.52 3.9 m 9074 12474 28 36.6 74 06.0 14.43 -0.71 4.3 m 9204 6780 29 37.0 72 35.0 16.08 +0.63 2.6 mf 9200 12258 30 37.1 74 04.0 15.62 -0.64 3.1 vf 9336 6900 31 37.2 72 53.6 16.18 + 1.39 2.5 m 9084 11112 32 37.5 73 18.9 16.35 +0.48 2.4 s 9264 9642 (3), N5, 33 37.7 74 20.4 16.46 +0.84 2.2 s 9522 5916 (4), N6, 34 38.3 75 33.4 14.65 -0.56 4.0 m 9552 8772 35 38.5 74 30.1 16.08 +0.86 2.6 vfd 9768 5352 36 38.6 72 29.4 15.33 -0.60 3.4 mf 9414 12612 37 38.7 73 40.8 15.86 + 1.05 2.9 mf 9630 8304 38 38.9 74 03.1 14.59 -0.78 4.1 m 9762 6972 39 38.9 74 20.9 13.92 -1.18 4.8 m 9804 5880 40 39.3 73 09.4 14.81 -0.73 3.9 m 9690 10236 41 39.5 73 32.5 16.27 +0.57 2.4 m 9810 8778 N8, 42 39.6 74 15.4 15.29 -0.80 3.4 vf 9972 6222 43 39.7 73 11.2 16.38 +0.54 2.3 s 9792 10092 (5) N7, r 44 39.8 73 36.2 17.4 + 1.3 1.3 var 9948 8448 (7) 45 39.9 73 35.3 14.03 + 1.20 4.7 vs 9918 8652 (6), N9, P 46 39.9 73 43.5 15.38 -0.23 3.3 f 9936 8148 47 39.9 74 01.1 14.55 -0.74 4.2 m 9996 7122 48 40.0 74 00.0 14.25 -0.11 4.4 ms 10008 7200 (8) S3, NGC 242, bl. with a star 49 40.1 73 28.2 16.33 +0.17 2.4 ms 9966 9084 P 50 40.3 73 45.9 15.87 -0.03 2.8 vfd 10074 8010 51 40.3 74 20.4 15.04 -0.74 3.7 f 10170 5940 52 40.4 73 59.0 14.44 -0.70 4.3 mf 53 40.5 72 51.5 14.80 -0.51 3.9 m 9942 11298 54 40.6 74 02.0 15.73 -0.57 3.0 vf 10194 7032 55 40.8 73 47.0 14.98 -0.67 3.7 vfd 56 40.9 73 10.6 18.0 + 1.2 0.7 f 10140 9870 P 57 41.1 73 47.1 14.18 -1.12 4.5 m 58 41.2 73 33.6 13.71 -1.02 5.0 m 59 41.2 73 56.1 13.93 -0.57 4.8 m 60 41.3 73 43.2 15.19 +0.58 3.5 vs (10) , N10, P, bl. with two stars 61 41.3 73 34.2 14.40 -0.62 4.3 m 62 41.3 73 49.7 14.36 +0.38 4.3 vs (11) , Nil, P, bl. with a star 63 41.4 73 15.3 13.52 -0.34 5.2 s 10242 9894 (9), S4 64 41.4 73 47.5 14.41 -0.59 4.3 m 65 41.5 72 05.0 13.84 -0.73 4.9 m 10140 14095 66 41.6 73 57.5 17.21 +0.3 1.5 f 67 41.7 73 56.1 13.75 -0.56 5.0 (12) , NGC 248 68 41.8 73 37.6 13.75 -0.56 5.0 s (13) 69 41.8 73 45.8 15.53 -0.40 3.2 vf 70 41.8 74 03.4 14.88 -0.78 3.8 f 9918 6984 71 41.8 74 15.3 14.62 +0.36 4.1 m 10506 6276 bl. with a star 72 41.9 73 49.2 15.14 -0.65 -3.6 vf 73 42.2 74 26.3 15.10 -0.71 3.6 vf 10608 6294

American Astronomical Society • Provided by the NASA Astrophysics Data System 1961AJ 66. . 1 69L No. 150 149 148 146 147 145 127 144 143 142 132 131 130 129 128 126 125 124 123 122 121 120 119 118 117 115 141 140 139 138 137 136 135 134 133 116 114 113 112 111 110 109 101 100 108 107a 107 106 105 103 102 104 80 99 98 97 95 94 93 92 91 90 96 89 88 87 86 85 84 83 82 81 79 78 76 75 74 77 b 042.3 American Astronomical Society •Provided bythe NASA Astrophysics Data System 46.7 46.7 46.8 46.7 46.5 46.4 46.3 45.4 45.4 46.3 46.2 46.0 46.0 45.5 45.5 45.4 44.0 46.1 45.8 45.7 45.6 45.5 45.4 45.4 45.3 43.3 43.3 42.8 42.7 42.7 42.5 45.8 45.8 45.7 45.3 45.3 45.2 45.2 45.1 45.1 45.0 45.0 45.0 44.4 44.3 44.3 44.3 44.3 44.2 44.1 43.8 43.8 43.7 43.6 43.5 43.5 43.4 43.2 43.2 43.1 42.9 42.9 42.8 45.0 44.9 44.5 44.4 44.9 44.9 44.6 44.5 R.A. 44.9 44.9 44.8 44.7 44.6 44.6 -72 32.9 72 41.5 72 56.5 72 45.5 74 01.7 73 53.8 73 08.5 74 17.5 73 55.4 73 42.8 73 09.8 74 50.3 73 56.4 73 58.3 73 56.9 73 59.7 73 21.0 73 08.5 74 23.4 72 40.0 73 40.7 73 37.9 72 27.8 73 46.8 73 40.3 73 05.0 74 16.2 73 42.7 72 27.8 73 54.0 73 43.8 73 41.8 73 35.9 73 48.2 72 56.0 73 39.6 73 40.7 72 39.0 74 19.9 73 03.6 73 49.2 73 52.7 73 39.6 73 55.8 73 47.6 73 39.0 73 35.4 72 53.1 72 37.9 74 21.0 73 47.8 73 47.3 73 41.3 74 01.2 73 59.5 73 55.0 74 13.0 73 46.9 73 41.4 73 42.5 73 21.7 73 43.7 73 48.9 73 59.2 73 36.0 72 52.8 74 12.7 73 47.1 73 31.0 72 44.7 73 53.8 73 48.0 73 36.8 73 16.4 73 24 73 45.0 73 35.6 73 07.9 Dec. 15.14 14.89 14.31 13.77 13.10 13.88 15.02 16.01 15.09 14.44 14.74 14.31 15.02 13.96 14.71 16.44 13.97 14.91 14.80 13.51 15.44 14.25 14.97 14.53 15.25 14.34 14.06 13.45 13.73 14.57 12.48 12.92 14.88 13.56 15.29 14.87 16.65 15.50 14.19 14.57 14.09 14.11 14.19 16.80 14.75 12.87 15.55 15.19 14.11 15.22 14.43 16.28 13.64 15.32 14.27 15.74 12.53 14.33 14.27 12.96 13.96 13.71 14.95 15.46 15.17 15.52 14.47 16.25 13.28 14.58 13.26 13.70 16.62 14.92 13.95 14.32 13.56 14.75 EMISSION-LINE OBJECTSINSMC -0.77 -0.91 -0.76 +0.75 + 1.14 -1.01 -1.14 +0.80 + 1.65 + 1.01 -0.48 -0.82 -1.13 +0.42 +0.34 + 1.29 -0.90 -0.51 -0.71 -0.57 +0.87 +0.70 +0.80 -0.57 +0.37 -0.73 -0.52 -0.07 -0.63 -1.10 -0.63 -0.71 -0.40 -0.95 + 1.40 +0.85 +0.58 +0.52 -0.93 -0.81 -0.75 +0.15 -0.99 -0.55 -1.01 -0.92 -0.61 -0.95 -0.46 -0.48 -0.56 -0.92 -0.45 -0.69 -0.76 -0.39 -0.73 -0.47 -0.66 -0.76 -0.99 -0.56 -0.58 -0.70 -0.62 -1.19 -0.44 -1.13 -0.69 -1.00 -0.63 -0.46 -0.43 -0.83 -0.61 -0.53 -0.50 -0.84 b-r -4.0 Tr pg 3.6 3.8 4.4 4.4 4.9 3.2 4.8 4.1 4.4 4.1 5.1 3.4 4.0 3.5 5.6 4.6 4.6 5.2 5.2 3.3 4.0 6.2 5.8 5.8 4.2 4.1 4.4 4.4 3.8 4.4 4.7 3.7 4.7 4.3 4.6 3.5 4.3 2.4 3.4 4.5 3.9 3.8 3.0 6.2 5.7 2.7 3.6 4.0 4.2 4.4 4.7 3.8 4.6 4.4 5.0 3.7 3.7 3.4 4.5 3.2 5.4 5.0 2.1 3.8 3.2 2.3 4.4 3.2 3.5 5.1 2.4 5.1 4.8 3.8 2.0 5.0 1.9 vf m f s ms vf ms m f vfd m f s vfd m m s m mf m m vf m m vfd vs mf vf m s mf mf vs m vfd m f mf m f vfd mf vfd vfd ms vf ms mf m m mf m m m m m vs vs f m m mf vs s m vfd ms m m mf m m vf m mf m mf m N20, elongated 11670 11988 NGC 265 N18, P N30A, diffuse,bl.withastar 11160 10380 11142 9834(19),S9 11634 11040 11646 11736 11256 11274 11202 6024 11004 10542 10542 11040 11136 11760S8 11058 12108 10944 10602P 10914 6432 11574 10332 11640 6180(27),N38,P 11370 5934 (20) , N29,P 11146 9369S10 11016 12774 11508 10248 11640 4164 11280 12780 11232 12180 10428 12522 11424 10332 11496 5790 11340 12066 11268 11262 (17) , N25,Hnsphere 11808 6282N40,P (14) (21) , N31,P (15) ,S6 (26) , N34,P,bl.withastar (18) , N26,P (16) ,S7 (25) , N32,P (23) , P (22) (24) , N33,P Remarks 179 1961AJ 66. . 1 69L No. 151 153 155 154 152 180 156 159 158 157 162 161 160 171 170 168 167 166 165 164 163 176 175 173 172 169 181 180 179 178 177 174 183 182 206 205 204 203 202 201 200a 200 185 184 192 191 190 189 188 187 186 209 208 207 193 219 217 216 215 214 213 212 211 210 197 196 195 194 220 218 199 198 222 221 224 223 225 226 © American Astronomical Society • Provided by theNASA Astrophysics Data System h 046.9 46.9 R.A. 47.1 47.1 46.9 47.2 47.1 47.2 47.2 47.3 47.2 47.2 47.9 47.7 47.6 47.6 47.6 47.5 47.5 47.5 47.4 47.4 47.3 47.3 48.0 47.9 47.8 47.8 47.8 47.7 48.1 47.8 48.1 48.1 48.1 48.1 48.2 48.2 48.3 48.3 48.2 48.2 48.8 48.7 48.5 48.5 48.5 48.4 48.9 48.8 48.7 48.7 48.7 48.6 48.6 48.6 48.6 49.4 49.4 49.3 49.3 49.3 49.3 49.2 49.2 49.2 49.2 49.2 49.1 49.1 49.0 49.0 49.0 48.9 49.4 49.1 49.1 -73 31.9 74 03.2 73 58.6 73 14.7 72 43.4 72 22.0 73 50.3 73 27.7 73 25.4 74 07.2 73 59.5 73 19.7 73 01.9 73 29.5 74 01.7 73 38.3 73 16.7 72 14.1 73 50.6 72 58.4 73 16.3 73 18.0 73 00.8 72 59.2 72 58.9 74 30.4 74 05.0 73 32.3 73 25.6 73 15.9 73 40.3 73 23.1 73 22.7 72 50.4 73 38.0 73 17.5 74 02.3 73 46.0 73 39.6 73 57.2 73 43.0 72 42.4 71 57.1 Dec. 73 34.1 73 53.6 73 32.2 73 11.6 72 45.8 72 32.4 72 38.4 72 31.2 73 52.6 73 18.2 73 52.4 72 59.7 72 41 73 46.8 73 45.1 72 59.1 72 17.9 73 36.9 72 38.9 73 59.2 73 51.6 73 15.0 72 16.2 72 52.5 73 46.1 72 42.7 72 43.5 73 26.6 72 38.0 73 00.5 72 45.1 72 50.3 73 53.3 73 14.2 14.61 12.98 15.66 15.02 13.46 14.02 11.87 14.79 14.60 14.31 15.48 12.60 14.07 14.29 14.10 13.62 16.08 15.19 13.81 14.80 14.16 14.53 13.79 14.11 12.76 15.06 14.45 16.32 14.75 15.96 14.36 14.11 12.92 15.20 13.24 14.90 14.24 13.77 14.62 14.65 13.59 15.18 15.98 14.99 14.45 13.37 14.82 13.86 14.44 12.91 14.59 16.07 12.60 14.97 14.88 12.87 14.68 14.71 13.57 15.91 14.49 14.54 14.20 13.93 14.33 13.44 14.35 14.37 14.24 14.97 14.10 14.56 15.88 14.70 14.24 15.04 14.17 -1.39 -0.74 -0.86 -1.00 -1.03 -0.65 -0.66 -0.60 +0.71 + 1.09 -1.04 -0.53 -0.90 -0.90 -0.71 -0.29 +0.75 -0.68 -0.52 -0.79 -1.04 -1.12 -0.95 -0.86 -1.03 -0.71 -0.28 -0.78 -0.68 -0.77 -0.92 -0.76 -0.15 -0.85 -0.55 -0.43 +0.69 -1.28 -1.05 -0.72 -0.48 +0.97 -0.92 -0.54 -1.18 -0.57 -0.58 -0.62 -0.83 -1.15 -0.90 -1.02 -1.29 -1.00 -1.18 -0.94 -1.06 -1.11 -0.70 -1.03 -0.57 -0.89 -0.93 -0.49 -0.27 -1.01 -1.03 -0.26 -0.76 -0.98 -0.88 -0.74 -1.10 -0.93 -0.39 -0.80 -1.04 b-r M .LINDSAY -3.9 M pg 4.1 3.7 3.0 5.2 4.7 4.4 5.7 6.8 4.6 4.9 4.4 4.5 4.3 4.1 4.2 3.5 4.6 4.9 4.6 6.1 4.0 3.9 4.2 4.6 5.9 5.1 3.2 4.1 3.5 3.6 2.6 5.8 4.9 5.5 2.4 2.7 4.0 4.5 3.8 3.7 4.4 4.2 3.5 3.9 3.8 4.6 4.4 4.3 4.0 4.5 4.0 4.0 4.8 4.3 4.2 5.1 2.7 5.3 4.3 3.7 4.5 5.3 3.7 4.5 4.1 5.1 4.2 4.1 6.1 4.8 3.7 2.8 5.8 5.8 2.8 2.6 f f f f m ms ms m f m f vf m vfd f vf mf m mf f mf mf vf ms ms m ms f mf s m vf ms mf ms vfd mf f vs f mf f s mf vs m f vfd m f f vf mf vf mf f f m f vf mf mf m vfd m vfd vfd vf m mf m m vf N39 Sll S12 11754 11868 11712 13128 nebulous, bl.withthreestars 11760 10704 11850 6798 11862 10950 11874 13620 (29) N51, nebulous 11910 11454 11976 5388(33),N43,P (30) S16 (28) (31) ,N41 12342 12540 12324 12606 12328 13488 Cl. 45 12036 14622(34),N44,P (32), N42,P Cl. 46 12152 11950S15 12120 13392 (35), N45,nebulous (36), N46,P,nebulousbl.withthreestars (37), N47,P Remarks 1961AJ 66. . 1 69L 300 302 299 296 295 293 292 291 271 270 301 297 294 298 289 284 283 282 280a 280 274 273 272 269 268 290 286 285 281 279 278 277 276 275 267 288 287 265 264 263 262 261 260 257 255 266 259 258 256 254 253 252 251 250 249 248 243 241 240 233 246 244 242 239 237 247 245 238 227 No. 236 228 235 234 232 230 229 231 © American Astronomical Society h 049.4 52.8 52.7 52.6 52.6 52.6 52.6 52.5 52.5 52.5 51.9 52.5 52.5 52.5 52.3 52.1 52.1 52.1 52.4 52.3 52.3 51.8 51.8 51.8 51.7 52.7 52.3 52.3 52.3 51.7 51.7 51.6 51.6 51.6 51.5 51.5 51.4 51.2 51.2 51.1 51.1 51.0 51.0 51.4 51.2 51.1 51.0 51.0 50.8 50.7 51.4 51.3 50.7 50.7 50.6 49.9 50.3 50.6 50.3 50.0 50.2 50.1 50.1 50.0 49.7 49.7 50.0 49.7 49.6 49.6 49.6 49.5 49.5 49.5 49.4 R.A. 49.5 49.5 -73 16.6 72 12.5 72 39.2 74 10.0 72 30.0 73 00.6 72 35.5 74 01.1 73 33.1 73 56.2 72 31.2 72 19.8 73 06.0 72 46.3 72 38.9 73 54.4 73 09.6 72 41.4 72 13.8 70 52.1 72 36.6 72 32.4 74 08.4 73 59.7 73 46.1 72 29.4 73 12.9 72 59.2 73 11.0 73 02.3 73 01.4 73 14.2 72 59.5 72 03.2 73 02.2 73 43.9 72 57.2 73 01.2 72 35.6 72 30.4 73 28.9 72 36.3 73 14.7 73 16.7 72 54.6 73 37.4 72 45.6 72 59.1 73 06.4 72 56.2 72 53.0 72 58.4 72 09.7 72 49.2 73 14.5 72 49.4 72 44.0 72 06.7 73 11.2 73 06.4 72 48.3 72 44.7 73 42.5 73 11.0 72 14.0 73 16.9 73 16.5 71 53.7 73 11.9 72 59.7 72 58.6 73 52.6 73 51.0 73 35.8 73 01.6 73 50.2 73 49.4 Dec. 16.40 14.96 15.27 14.40 14.24 14.27 15.87 14.96 14.56 14.59 13.06 13.68 15.00 16.0 15.34 14.49 14.31 14.13 15.41 14.32 14.76 15.26 14.11 14.54 14.46 14.82 14.50 15.11 14.96 14.24 13.49 14.44 14.33 14.82 13.97 14.52 13.92 14.65 14.92 15.37 14.47 15.25 14.74 13.00 14.45 15.95 15.16 14.93 15.71 14.78 15.28 14.53 13.77 13.31 15.41 15.39 14.63 14.28 14.02 14.55 14.61 13.75 14.22 14.17 15.93 15.13 12.99 13.97 14.47 15.02 16.32 15.71 14.45 15.16 14.61 15.03 13.22 EMISSION- LINEOBJECTSINSMC +0.36 -0.66 +0.40 -0.79 -0.67 +0.51 -0.64 -0.83 +0.89 +0.81 +0.57 +0.41 +0.9 + 1.25 -0.74 -0.59 -0.63 -1.11 -0.66 -0.77 -0.86 -0.04 -0.73 -0.90 -0.88 +0.42 -0.08 + 1.28 -0.73 -0.88 -1.09 -0.72 -0.83 -0.71 -0.88 -0.74 -0.75 -0.72 -1.10 -0.71 -0.81 -0.89 -0.82 -1.00 + 1.03 -0.78 -0.83 -0.45 -0.30 -0.61 -0.83 -0.57 -1.03 -0.71 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withastar P (44) , N55,P (43) (42), S19,P 12654 14040N53 12552 13602 (41), S18 (38), S17 (39) ,N52A,possiblyHusphere 12420 14862 (40) ,N52B,possibly77iisphere Remarks 181 1961AJ 66. . 1 69L 303 No. 308 306 305 304 310 309 307 326 325 324 323 322 321 320 319 318 317 316 315 314 313 312 311 328 327 330 329 332 331 333 182 334 335 337 336 341 340 339 338 361 360 359 358 357 356 344 343 342 379 378 377 362 355 354 350 348 347 346 345 375 370 369 366 365 364 363 353 352 351 349 380 376 374 373 372 371 368 367 h 052.8 American Astronomical Society •Provided bythe NASA Astrophysics Data System R.A. 53.0 53.0 53.8 53.7 53.7 53.3 53.3 53.3 53.2 53.1 53.0 53.0 53.4 53.2 54.5 54.1 53.9 53.9 53.9 53.9 53.5 54.8 54.8 54.8 54.5 54.5 54.4 54.1 53.0 54.9 55.0 55.1 55.2 55.2 55.2 55.2 55.4 55.3 55.3 58.0 57.9 57.8 56.7 56.6 56.5 56.4 56.1 55.8 55.6 55.5 55.4 58.1 57.6 57.3 57.3 57.1 56.7 56.7 56.2 56.1 56.1 55.9 55.9 55.9 55.8 55.7 57.7 57.6 57.6 57.6 57.4 57.2 57.1 57.1 57.0 56.0 56.0 -73 00.6 72 50.9 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vf mf f X s ms f m vf f f vf m m vf m f mf vfd mf vf f m mf mf mf m vs P, NGC330 NGC 330 NGC 346 NGC 346 bl. withastar 13272 8736 13284 8868 13440 8742 13350 8748(46),S24 13368 6810 13572 12408(47),S25 13662 14532 13590 13314 13860 13386 13926 13968N67,P 13734 12720 13740 13134N65 13440 4470N60,P 13902 9060P 13542 8784 P NGC 346 14130 13422 (49) (50) , N63,sphere (51) , N64A,P,bl.withastar (48), N61,P 14094 12378(56), (54), NGC346,bl.withastar 14160 12432(60),S29 (52), N68,P 13290 8202 14718 13296 14298 12594 (57) , NGC346 14736 12912 14388 14058 14172 13830P (58) , NGC346 14670 14412 14448 7110 14256 9162(61) (55), NGC346 14256 4266 14580 12420bl.withastar (59), S28,NGC346,0 14610 13980(62),N71,P,bl.withastar Remarks N70, P 1961AJ 66. . 1 69L 381 382 383 384 No. 385 387 386 389 393 392 391 390 388 396 395 394 399 398 397 401 400 402 409 404 403 407 406 405 413 411 418 416 414 412 410 408 422 419 420 417 415 425 424 423 427 421 432 430 429 426 431 428 436 435 434 433 438 439 437 440 442 441 446 445 444 443 449 445a 450 448 447 452 451 454 457 455 453 456 h h h 058.1 059.8 l00.1 American Astronomical Society •Provided bythe NASA Astrophysics Data System 58.2 58.1 R.A. 58.3 58.5 58.5 58.4 58.7 58.6 58.5 59.3 59.0 58.9 59.4 59.4 59.3 59.5 59.4 59.4 59.5 59.5 59.5 59.6 59.5 00.2 00.1 59.7 59.7 00.3 00.3 00.3 00.2 59.7 00.5 00.4 00.4 59.7 00.8 00.7 00.6 00.5 00.5 00.8 00.6 01.2 01.0 01.2 01.1 01.4 01.3 01.3 01.5 01.5 01.6 01.8 01.6 01.8 01.8 01.8 01.8 01.9 01.9 01.9 02.3 02.1 02.8 02.8 02.7 02.5 02.5 02.9 02.9 02.9 03.1 03.0 03.1 -72 55.5 73 06.1 72 39.1 72 27.6 72 25.5 72 43.0 72 33.2 72 55.5 73 19.1 72 01.9 72 31.7 72 40.6 72 54.3 73 00.8 72 25.6 72 40.8 72 18.2 73 02.0 72 45.8 72 40.1 72 25.4 73 22.8 73 12.3 72 36.9 72 57.7 72 38.7 Dec. 73 02.5 72 34.4 73 15.8 73 26.1 73 15.7 73 26.1 72 53.1 72 35.5 72 22.0 72 36.0 73 05.3 72 28.5 72 40.7 72 45.0 72 22.5 72 45.5 72 37.8 73 53.8 72 59.2 73 17.2 73 15.7 72 35.7 72 34.0 73 20.1 72 51.8 72 50.1 72 32.2 72 37.8 72 57.8 72 49.7 72 31.4 73 18.6 72 30.9 72 55.7 72 56.8 73 18.5 73 04.5 73 19.9 72 56.2 73 21.8 72 49.6 72 32.6 72 23.4 72 57.8 73 00.6 76 20 72 44.4 73 21.4 72 18.2 72 59.8 72 32.5 75 01.3 13.25 14.67 14.38 13.81 15.16 15.05 14.21 14.66 14.68 12.73 14.69 13.78 13.90 13.99 14.24 13.64 14.26 14.29 15.26 14.38 12.62 14.84 14.16 14.19 13.16 13.85 14.13 13.77 14.82 14.67 14.99 15.21 14.36 15.18 15.65 14.81 13.95 14.70 16.66 14.89 13.46 12.68 14.12 14.10 14.14 15.65 13.86 13.48 14.17 14.49 14.46 13.67 13.89 13.88 14.03 14.35 14.28 12.88 15.25 EMISSION-LINE OBJECTSINSMC 13.02 13.60 15.00 13.00 14.45 14.34 14.44 14.75 13.56 14.21 12.66 13.05 14.88 14.04 13.28 14.56 14.46 12.80 17.0 -0.59 -0.70 -0.80 -0.89 -0.71 -0.88 -0.93 -0.87 -0.31 -0.51 -0.73 -0.57 -1.04 -0.93 -0.64 -0.88 -0.93 -0.60 -0.85 -0.90 -1.03 -0.82 -0.55 -0.60 -0.81 -0.89 -0.76 -0.24 -0.40 -0.68 -0.74 -0.47 -0.79 -0.38 -0.55 -0.23 -0.50 +0.41 +0.05 -0.26 -0.99 -0.76 -0.77 -0.77 -0.85 -0.81 -0.93 -0.84 -0.77 -0.55 -0.67 -1.02 -0.72 -0.85 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12948 (68), NGC395 c (73), NGC395,bl.ornebulous 15606 3384 15948 13278(75),S46,0 (69) S43 (71), N78a,NGC395,nebulousonredplates (70) (67), S42 (77), S44 Remarks 183 1961AJ 66. . 1 69L 458 460 459 No. 462 461 463 468 466 465 464 470 469 467 471 473 472 184 476 475 474 485 478 477 490 489 488 487 486 484 483 482 481 480 479 495 494 493 492 491 498 497 496 499 507 506 504 502 501 500 509 508 505 503 511 514 513 512 516 515 510 517 518 527 525 524 523 522 521 520 519 530 529 528 526 531 534 532 533 h l03.1 American Astronomical Society •Provided bythe NASA Astrophysics Data System 03.3 03.2 R.A. 03.3 03.5 03.4 03.6 03.6 04.5 04.5 04.1 04.0 03.6 04.5 05.2 04.6 05.4 05.4 05.8 05.4 05.4 06.4 06.1 05.7 07.1 06.5 06.4 06.2 08.2 07.7 07.4 07.3 07.1 09.8 09.2 08.6 08.4 08.3 10.7 10.5 12.0 11.9 11.9 11.6 11.4 11.2 11.0 11.0 12.6 12.2 12.2 12.1 12.0 11.3 11.3 11.1 12.8 12.8 21.1 20.9 12.9 12.8 15.8 13.3 18.1 17.3 16.9 16.3 16.0 15.8 14.6 13.1 18.2 17.2 18.5 18.4 18.3 -73 29.5 73 18.4 73 17.0 72 40.3 72 49.2 72 30.6 73 47.8 72 47.4 72 47.7 72 34.1 72 51.7 72 52.1 72 49.2 72 53.4 73 06.3 73 42.4 72 31.4 72 30.1 72 31.7 72 55.8 72 55.6 72 42.4 72 39.3 73 47.1 Dec. 72 56.2 72 43.9 73 16.9 73 18.6 73 18.4 72 54.9 73 22.1 74 22.7 73 07.8 73 49.3 72 32.4 72 54.6 72 56.3 73 47.9 73 47.4 73 43.7 73 26.3 73 50.3 72 52.0 74 00.0 73 51.0 73 43.2 73 52.2 73 51.2 73 45.6 73 47.5 73 46.7 73 47.9 73 50.0 73 51.6 72 53.0 73 50.2 72 53.4 73 41.5 73 52.2 73 50.9 74 04.5 72 49.8 74 03.1 74 16.0 73 59.5 73 52.1 73 02.8 73 46.4 73 52.5 74 02.8 73 08.9 73 47.5 73 49.3 73 13.5 73 55.0 73 45.3 73 41.4 14.33 14.97 15.29 15.19 13.75 14.57 14.26 14.18 14.10 14.19 13.46 13.67 14.15 13.05 14.06 14.15 15.82 14.69 16.25 13.52 15.09 14.58 12.80 16.22 16.38 14.36 14.21 10.38 14.23 15.41 16.22 14.24 16.06 14.20 13.73 13.48 14.67 16.50 13.35 13.41 14.17 15.54 16.68 14.73 15.16 13.55 15.06 14.34 14.17 11.60 13.87 14.88 15.87 13.93 14.34 12.75 14.62 14.14 14.21 14.71 14.82 15.64 14.41 14.34 14.42 14.75 14.00 16.92 16.15 14.25 15.83 14.00 13.83 15.94 13.78 15.47 -0.63 +0.29 -0.65 -0.63 -0.63 -0.31 -0.69 -0.58 +0.59 +0.08 + 1.37 + 1.22 +0.88 +0.61 -0.90 +0.24 +0.64 -0.55 -0.60 -0.78 -0.39 +0.67 -0.63 -0.59 -0.65 -0.54 -0.57 -0.78 -0.92 +0.08 -0.37 -0.51 -0.75 -0.78 -0.88 -0.68 -0.64 -0.25 -0.97 -0.32 -0.64 -0.86 -0.08 -0.71 -0.54 -0.34 -0.56 -0.45 -0.80 +0.11 -0.11 -0.11 -0.84 +0.88 + 1.67 +0.72 -0.38 -0.48 -0.12 + 1.39 -0.68 -0.71 -0.39 -0.56 -0.49 -0.37 -0.52 -0.35 -0.90 -0.79 -0.60 -0.90 -0.40 -0.26 -0.51 -0.15 b-r M. LINDSAY -3.4 37p g 4.4 3.7 3.5 4.1 4.0 4.6 4.6 4.6 5.0 4.1 4.5 3.6 4.5 5.2 2.9 4.6 4.3 4.5 5.9 2.4 5.0 4.5 4.4 4.0 4.5 2.3 8.3 5.2 5.6 3.3 4.5 4.5 3.2 4.0 2.6 5.0 5.3 4.4 2.5 2.2 3.5 2.0 2.5 5.2 5.4 3.6 4.8 5.2 4.5 4.8 3.8 7.1 2.8 4.4 6.0 4.5 4.7 4.1 4.0 4.3 4.4 4.3 4.7 4.6 4.4 3.9 3.9 3.1 4.0 3.2 2.8 3.9 2.9 2.6 1.8 f f vf vf f m m m f f f m m f f f m mf f m mf m f f m m vvs ms f f vfd vf m vfd f mf mf m s s ms ms m s mf m vvs vf s m mf mf vs m mf f m f mf ms s f f mf vfd mf vfd m m m vfd mf mf vfd N79, nebulousstaronred 15906 8964 C84 S51 S54 C84 C84 15990 8190(76),S48 NGC 456,bl.withastar NGC 456 NGC 456 16512 7908S53 16650 8094(79),N81,IC1644 NGC 456 16962 9558 17304 5652(80),N82 17574 10188 17208 7692 17088 7668S55 17010 9516 17106 10914 16890 9666 (78), S50 17508 12450 17400 10980S56 17238 11082 17910 9276 17814 9012 NGC 465 18152 6949S58 NGC 465 10578 18204 10872 18234 (83) (82) , N83,NGC456,nebulousstar N85 NGC465 (84) , N84,HnNGC456 (81), N83,NGC456,bl.withstars (86) , NGC460,bl.withastarornebulositv (87) , NGC460,bl.withastar (85) , N84a,NGC460,bl.withastar 20328 7020S61 20700 10170 (89) , N84,NGC460 (88) , N84,NGC460,nebulousstar 18936 6708S59 19290 9660 19548 6540 19872 13046 19404 7968 19572 9930 19236 7620 19068 7506 18570 6558 19740 7650(91),N87,P 19560 6660 19620 7788 19608 7272 (90) , N86,P,bl.withtwostars b c a b D Remarks 1961AJ 66. . 1 69L 535 536 No. 538 537 539 540 542 541 545 544 543 546 549 548 547 551 550 552 554 553 556 555 559 558 557 560 561 562 576 568 566 565 563 575 574 573 572 571 570 567 564 577 569 578 581 580 579 583 582 586 585 584 588 587 590 589 593 592 591 Henize, K.G.1956,Astrophys.J. Suppl. II,No.22. Arp, H.C.1958a,AstronJ.63,118. .1955,Pubis.Astron.Soc.Pacific 67,350. .1960,ibid.65,404. .1959,ibid.64,254. .1958b,ibid.63,273;andotherpapersonsouthernhemis- Elsässer, H.1958,Z.Astrophys.45, 24. de Vaucouleurs,G.1954,Observatory 74,881. Gasciogne, S.C.B.1954,Australian J.Sei.Suppl.17,No.3. Bierman, L.1957,LickObs.Bull.18,57. Baade, W.1955,ibid.60,151. Cannon, A.J.1933,HarvardBull. No. 891. phere photometry. © American Astronomical Society • Provided by theNASA Astrophysics Data System h h h l21.5 200.5 l58.4 21.5 R.A. 21.8 21.6 26.9 22.6 27.4 24.6 22.9 22.2 37.2 37.2 27.6 27.6 40.0 39.1 29.0 28.8 41.3 40.9 42.5 40.9 42.7 42.6 43.4 43.3 43.5 43.7 43.8 47.7 47.9 47.9 45.7 44.7 48.9 48.4 53.6 52.5 52.5 52.4 52.2 54.5 54.4 54.3 52.4 54.9 52.3 56.6 55.7 57.9 57.5 06.9 05.6 58.0 07.3 14.1 11.8 -73 39.7 74 32.9 73 39.5 74 04.0 73 44.8 73 13.8 74 05.4 73 54.3 73 35.2 73 38.5 73 55.8 73 49.8 73 54.8 73 41.4 73 40.7 73 19.9 73 46.9 73 35.9 74 26.6 73 44.5 75 11.0 74 57.4 74 29.8 75 13.4 75 13.0 74 22.7 74 36.0 75 14.3 74 09.4 Dec. 74 29.2 74 36.6 75 23.1 75 36.9 75 18.9 75 06.7 75 32.4 74 45.9 74 36.9 74 27.8 75 30.1 74 26.7 74 37.9 74 22.8 75 04.3 74 42.9 74 31.2 75 16.2 74 31.1 74 59.9 74 22.9 75 10.6 74 44.9 75 00.6 74 49.6 74 50.5 75 16.6 75 06.1 75 09.8 74 46.2 REFERENCES (17.8) 17.12 14.05 12.77 14.11 13.96 14.13 12.32 14.48 14.58 13.25 14.56 13.94 15.39 12.12 15.55 15.59 15.97 14.31 11.92 14.99 12.23 14.97 16.83 14.29 16.18 15.23 14.92 14.81 14.51 14.83 16.70 15.97 17.26 14.65 16.48 13.29 14.15 14.03 13.93 17.11 16.87 15.63 EMISSION-LINE OBJECTSINSMC 14.97 15.01 15.29 15.69 15.32 15.47 15.35 15.10 15.41 13.82 15.96 15.93 15.70 15.40 15.79 14.81 +0.52 + 1.06 -0.56 -0.52 +0.24 +0.39 +0.41 -0.85 -0.53 -0.79 +0.46 -0.02 -0.78 -0.64 + 1.20 -0.75 -0.64 +0.10 +0.63 -0.79 +0.26 + 1.08 -0.36 -0.67 -0.70 +0.42 -0.51 -0.28 + 1.52 +2.20 -0.63 -0.62 -0.40 +1.78 -0.59 -0.64 -0.28 +2.6 +2.4 -0.14 -0.60 -0.38 + 1.61 +0.28 +0.30 -0.40 +0.14 -0.49 +0.19 -0.22 + 1.24 +0.96 +0.60 -0.28 -0.17 -0.34 +0.30 +0.26 -0.19 -4.6 4.2 4.6 4.7 4.8 4.1 4.1 4.6 5.9 6.4 4.4 3.1 3.3 5.4 1.6 3.2 3.7 6.5 6.1 6.8 4.4 3.7 2.7 4.2 3.5 3.8 3.9 2.5 3.9 1.9 4.0 2.0 4.6 2.7 2.2 4.7 4.8 5.4 1.4 3.1 0.9 3.7 3.2 3.7 3.4 1.8 1.6 3.3 3.0 3.4 3.6 3.4 4.9 3.0 3.3 2.8 3.9 2.7 2.9 Thackery, A.D.(privatecommunication). Leavitt, H.S.1907,HarvardAnn.60,4. Nail, V.McKibbenandShapley, H. 1953,Proc.Natl.Acad.Sei. Nail, V.McKibben.1940,Harvard Ann.108,13. .1958,MonthlyNoticesRoy.Astron.Soc.118,172;Armagh Lindsay, E.M.1953,MonthlyNoticesRoy.Astron.Soc.115,248; Hogg, A.R.1955,MonthlyNoticesRoy.Astron.Soc.115,473. Henize, K.G.andMiller,F.D.1951,Pubis.Obs.Univ.Michigan Koelbloed, D.1956,Observatory76,894. Shapley, H.1940,HarvardBull.914, p.8. King, I.1951,Astron.J.56,43. f f m vvs f m mf f s x f mf f s f vf vfd vf m f vf ms f vf vf ms vf m f f mf vfd f vfd f vfd m mf vf m vfd vfd f vf vf vf mf f vf mf f vf m vf f m vf mf Armagh Obs.Contrib.No.17;1956,MonthlyNoticesRoy.Astron. Obs. Contrib.No.23. Soc. 116,649;ArmaghObs.Contrib.No.21. X. U. S.39,358;HarvardRepr.375. 20190 4740P 20568 7908C101 20586 6384 20430 7590C103 20538 7896(92),C101 20928 7926C101 20484 6468 21924 6846C107 21354 8094 22122 9252(94),S63 24870 6786 24474 7200 22602 8820(96),S64,0 22050 7128(93),S62,C107 24660 1650(97),0,S65,i+¡strong, 24732 4464 24456 7146 22260 6720(95),0,C107 21972 6810C107,bl.withastar 24816 1500 24564 2520 24858 4620 24630 1584 bl. withastar bl. withastar H largediffuse,littlecontinuum,bl.withfainterstar. a Remarks 185