DOCSLIB.ORG

STERNBILD SCHWAN (Cygnus – Cyg)

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
STERNBILD SCHWAN (Cygnus – Cyg) STERNBILD SCHWAN (Cygnus – Cyg) Der Schwan ist ein Sommersternbild des nördlichen Himmels. Laut Sage wurde Orpheus in einen Schwan verwandelt und zusammen mit seiner Harfe (Lyra = Leier) an den Himmel versetzt. Der Schwan befindet sich in einer äußerst sternreichen Gegend innerhalb des Milchstraßenbandes. Deneb, der Hauptstern, ist der linke obere Eckpunkt im Sommerdreieck. Wir finden im Schwan entlang der Milchstraße viele Offene Sternhaufen und Galaktische Nebel wie z.B. den „Nordamerikanebel“ NGC 7000 und den berühmten Supernova-Überrest des Cyrrusnebels. Ebenfalls bekannt ist der farbige Doppelstern „Albireo“. Der Schwan kulminiert im Juli/August gegen 24.00 Uhr. Er befindet sich innerhalb der Koordinaten RE19h10m bis 22h02m und DE +28° bis +62°. Die Nachbarsternbilder sind im Norden Kepheus und Drache, im Westen Drache und Leier, im Süden Füchschen und Pegasus, und im Osten Pegasus und EiIdechse. Der Schwan ist nördlich 62° geografischer Breite zirkumpolar und südlich –29°nicht mehr vollständig sichtbar. Die Objekte 1. Das „Kreuz des Nordens“ 2. Die Doppelsterne 3. Die Veränderlichen 4. Die Deep Sky Objekte 5. Die Röntgenquelle X-1 Cygnus 1. Das „Kreuz des Nordens“ Vom nördlichen Sommerdreieckstern Deneb ausgehend sehen wir ein auffälliges Kreuz aus Sternen der 1. bis 3. Größenklasse. Sie bilden das Gerüst des Sternbildes und markieren einen mit dem Kopf voraus fliegenden Schwan. Manchmal wird diese Formation auch das „Kreuz des Nordens“ genannt. Es sind dies die Sterne Deneb (Schwanz), Sadir (Brust), Gienah und Delta (linker und rechter Flügel), Eta (Hals) sowie Albireo (Kopf). DENEB, Alpha (α) Cygni, 50 Cygni; RE 20h 41' 26“ / DE +45° 17' arab.: „Schwanz“; mv= 1,21mag; Spektrum= A2Ia; Distanz= 3229LJ; LS= 260.000fach; Mv= -8,7Mag; MS= 19fach; RS= 203fach; OT= 8525K; Rotationsdauer= 40 Tage; Rotationsgeschwindigkeit= 20km/s (jeweils am Äquator); EB= 0.005“/Jhr.; RG= -4,5km/s; Alter ca. 11,6Mill. Jahre; zur Cyg OB7 Assoziation. Deneb hat in 75,3“ Distanz (PW 106°) einen Begleiter mit 1,7mag und einer Mv von 1,9Mag. Deneb gehört zu einer Gruppe von nicht radialen Pulsationsveränderlichen, deren Namengeber er auch ist (α Cyg). Deneb ist der 19. hellste und einer der leuchtkräftigsten Sterne am Himmel. In einem Abstand von 10 Parsec (32,6 LJ= Absolute Helligkeitsentfernung) wäre dieses Monster so hell wie unser Mond im Ersten oder Letzten Viertel). Sternenwinde verursachen einen Masseverlust von 0,8 Millionstel Sonnenmasse pro Jahr,das sind etwa 100.000al mehr als unsere Sonne! Deneb ist in ein paar Millionen Jahren der Kandidat für eine Supernova vom Typ II). ALBIREO, Beta (β) Cygni; 6 Cyg; RE 19h 30‘ 43“ / DE +27° 58‘ arab.: „Schnabel der Henne“; mv= 3,06mag; Spektrum= K3II; Distanz= 386LJ; LS= 675fach; Mv= - 2,3Mag; MS= 5fach; RS= 56fach; OT= 4300K; Rotationsdauer= 0,6Tage; Rotationsgeschwindigkeit= 250km/s (jeweils am Äquator); EB= 0,002“/Jhr.; RG= -18,0km/s; Alter ca. 40Mill. Jahre; Albireo markiert den Schwanenkopf und ist ein bekanntes Mehrfachsystem mit schönem Farbkontrast: ein orangeroter heller Riesenstern (K3II) und ein bläulicher Hauptreihenstern (B8Ve) sind schon in kleinen Teleskopen trennbar. Zu diesem System gehört noch ein bläulicher HrSt (B8:p), der von dem hellen Riesen nur etwa 40AE (6Mrd. km) entfernt ist. Siehe 2. Doppelsterne SADIR, Gamma (γ) Cygni; RE 20h 22' 14“ / DE +40° 15 auch Sadr bzw. Sador; arab.: „Brust der Henne“'; mv= 2,23mag; Spektrum= F8Iab; Distanz= 1520 LJ; LS=23.000 fach; Mv= -6,1Mag; MS= 12,1fach; RS= 150fach; OT= 6150K; Rotationsgeschwindigkeit= 20km/s (am Äquator); EB= 0,002“/Jhr.; RG= -7,5km/s; Alter ca. 17,6Mill. Jahre; Sadir ist der Bruststern und ein Mitglied des Offenen Sternhaufens NGC 6910; RUKH, Delta (δ) Cygni, 18 Cygni; RE 19h 44 '58“ / DE +45° 08 auch Al Fawaris (arab. „der Reiter“); mv= 2,86mag; Spektrum= B9.4IV; Distanz= 171 LJ; LS= 164fach; Mv= -0,7Mag; MS= 4,7fach; RS= 3,3fach; OT= 10120K; Rotationsgeschwindigkeit= 135km/s (am Äquator); EB= 0,069“/Jhr.; RG= -20,1km/s; Rukh ist der westliche Schwanenflügel und ein Mehrfachsystem. Siehe 4. Doppelsterne. GIENAH (ε) Cygni, 53 Cygni; RE 20h 46' 12“ / DE +33° 58' Gienah, arab.: „der Flügel“; mv= 2,48mag; Spektrum= K0III; Distanz= 72,06LJ; LS= 41fach; Mv= 0,8Mag; MS= 2fach; RS= 10,8fach; OT= 4710K; Rotationsdauer= Tage; Rotationsgeschwindigkeit= km/s (jeweils am Äquator); EB= 0,484“/Jhr.; RG= -12,4km/s; Alter ca. 1,5Mrd. Jahre; Gienah ist der östliche Schwanenflügel und ein Doppelsternsystem. Komponente B ist ein roter M2V Zwergstern in ca. 1700AE (255Mrd. km) mit einer Orbitdauer von etwa 50000 Jahren. In 55“ bzw. 78“ befinden sich 2 Sternchen mit 9mag und 13mag, die allerdings nicht zu Gienah gehören. ist Eta Cygni, 21Cygni; RE 19h 56' 18“ / DE +35° 05' mv= 3,89mag; Spektrum= K0IIIvar; Distanz= 139,4 LJ; LS= 42fach; Mv= 0,7Mag; MS= 2,5fach; RS= 10,5fach; OT= 4775K; Rotationsdauer= Tage; Rotationsgeschwindigkeit= km/s (jeweils am Äquator); EB= 0.042“/Jhr.; RG= -26,5km/s; Eta markiert den Schwanenhals Doppelstern; mv Komponente B= 12,0mag, Spektrum= M0V; Distanz A-B= 7,8“; PW= 208°; Das Sternchen hat 0,5MS; die mittlere Bahnhalbachse= 325AE (48,75Mrd. km); Orbitdauer= ca. 3500 Jahre. In 46“ bzw. 163“ Distanz befinden sich zwei weitere optische Begleiter 11. und 10. Größe. 2. Die Doppel- und Mehrfachsterne ALBIREO, Beta (β) Cygni; RE 19h 30‘ 43“ / DE +27° 58‘; Gesamthelligkeit 3,05mag mv Komponenten Aa + Ac= mv= 3,18mag + 5,82mag; Spektren= K3II + B8:p; Distanz Aa-Ac= 0,536“ (40AE= 6Mrd. km); Orbitperiode= 213,859 Jahre; Komponente Ac: LS= 109fach; Mv= -0,3Mag; MS= 3,2fach; RS= 3,5fach; OT= 12100K; mv Komponenten Aa + B= 3,18mag + 5,09mag; Spektren Aa + B= K3II + B8Ve; Distanz Aa-B= 34“; PW= 54° (2015); Komponente B: Distanz= 376 LJ; LS= 90fach; Mv= -0,2Mag; MS= 3,7fach; RS= 2,7fach; OT= 13200K; EB= 0,010“/Jhr.; Alter ca. 200Mill. Jahre; siehe 1. Schwansterne Besselscher Stern, 61 Cygni; RE 21h 06‘ 56“ / DE +38° 45‘; Gesamthelligkeit 5,20mag Komponente A: mv= 5,35mag; Spektrum= K5V; Distanz= 11,36LJ; LS= 0,084fach; Mv= 7,5Mag; MS= 0,75fach; RS= 0,7fach; OT= 4450K; EB= 5,164“/Jhr.; RG= -64,3km/s; Alter ca. 6,1Mrd. Jahre; Komponente B: mv= 6,05mag; Spektrum= K7V; Distanz= 11,43LJ; LS= 0,039fach; Mv= 8,3Mag; MS= 0,65fach; RS= 0,7fach; OT= 4120K; EB= 5,154“/Jhr.; RG= -63,5km/s; Distanz A – B= 31“; PW= 151° (2005); 61Cyg besteht aus zwei roten Zwergsternen, die rund 85AE ( 12,75Mrd. km) von einander entfernt sind und sich in 659 Jahren einmal umrunden. Die B- Komponente ist spektroskopisch doppelt und somit handelt es sich sogar um ein 3fach- System. Die Entfernungen ändern sich innerhalb der Umlaufperiode von 11“ bis 32“. Im Jahre 2010 ist die größte Distanz erreicht worden, bevor etwa 2400 n. Chr. der kürzeste Abstand hergestellt sein wird. Dieses uns mit 11,4 LJ relativ nahe System Ist deshalb so interessant, weil es an 61 Cyg Anno 1838 von F.W.BESSEL die erste sehr genaue Entfernungsbestimmung gemacht wurde. Komponente A ist BY Dra- verändelich; Amplitude= 5,19mag – 5,27mag; RUKH, Delta (δ) Cygni; RE 19h 44 '58“ / DE +45° 08; Gesamthelligkeit 2,86mag mv Komponenten A + B= 2,89mag + 6,27mag; Spektren= B9,5V + F1V; Distanz A-B= 2,6“; PW= 222° (2005); mittlere Bahnhalbachse= 162AE (24,3Mrd. km); Orbitdauer= 780 Jahre; Komponente B: LS= 6,2fach; MS= 1,6fach; RS= 1,5fach; OT= 7300K; mv Komponenten A + C= 2,89mag + 12,0mag; Spektren A + B= B9,5IV + K5V; Distanz AQ-C= 63,4“; PW= 67° (1998); siehe 1. Schwansterne Omikron 1 (31), 20h 13' 38“/ DE +46° 44' Komponente Aa: mv= 3,80mag; Spektrum= K4Iab; Distanz= 1350LJ; LS= 4300fach; Mv= -4,3Mag; MS= 4-6fach; RS= 120fach; OT= 3900K; EB= 0.005“/Jhr.; RG= -6,9km/s; spektrobinär; mv Aa+Ab= 4,30mag + 4,90mag; Spektren= K2II + B4IV-V; mittlere Bahnhalbachse= 11AE (165Mill. km); Orbitdauer= 3786,1 Tage; Komponente Ab: MS= 6-7fach; RS= 52fach; Mehrfachstern; mv Komponenten Aa – B= 3,78mag + 13,0mag; Distanz Aa-B= 36,6“; PW= 331° (1878); mv Komponenten Aa + C= 3,78mag + 6,99mag; Spektren Aa + C= K4Iab + B9V; Distanz Aa- C=105,8“; PW= 174° (1998); Komponente C (31 Cyg) ist optisch doppelt mit Omikron1; Distanz= 1720LJ; LS= 360fach; Mv= - 1,6Mag; EB= 0,006“/Jhr.; RG= +7,0km/s; mv Komponenten Aa – D= 3,78mag + 4,81mag; Spektren Aa + D= K4Iab + A5IIIn; Distanz Aa-D= 337,5“; PW= 323° (1835); Komponente D (30 Cyg); Distanz= 717LJ; LS= 480fach; Mv= -1,9Mag; EB= 0,008“/Jhr.; RG= - 26,0km/s; ebenfalls optisch doppelt mit Omikron1; siehe 2. Alphabethsterne My (µ) Cygni, RE 21h 44' 08“ / DE +28° 44'; Gesamthelligkeit 4,49mag mv Komponenten A + B= 4.75mag + 6.18mag; Spektren= F6V + G2V; Distanz A-B= 1,8“; PW= 311°; (2005); mittlere Bahnhalbachse= 118AE (17,7Mrd. km); Orbitdauer= 789 Jahre; Komponente B: LS= 1,4fach; Mv= 3,9Mag; MS= 1,1fach; RS= 1,2fach; OT= 5780K; mv Komponente C= 11,5mag; Distanz A-C= 72,6“; PW= 290° (1999); mv Komponente D= 6,89mag; Distanz A-D= 197,5“; PW= 45° (2001); Komponente D: Spektrum= A5V; Distanz= 251LJ; LS= 9fach; Mv= 2,5Mag; MS= 1,7fach; EB= 0,047“/Jhr.; RG= +4,7km/s; in ca. 1000AE (150Mrd. km) Distanz befindet sich ein M2V Zwergstern als Partner; Komponenten C+D sind optisch doppelt; siehe 2. Alphabethsterne Psi (ψ) Cygni, RE 19h 55' 37“ / DE +52° 26'; Gesamthelligkeit 4,91mag spektrobinär; mv Komponente Aa + Ab= 5,60mag + 6,10mag; Spektren Aa + Ab= A4V + A7V; mittlere Distanz= 0,1“; mittlere Bahnhalbachse= 12AE (180Mill. km); Orbitdauer= 21 Jahre; Komponente Ab: MS= 2fach; RS= 2,5fach; OT= 7650K; mv Komponente Aa/Ab + B= 5,03mag + 7,52mag; Spektrum B= F4V; Distanz Aa/Ab-B= 2,4“; PW= 178° (2003); mittlere Halbachse= 650AE (97,5Mrd.
Load more

Recommended publications
  • Divinus Lux Observatory Bulletin: Report #28 100 Dave Arnold
    Vol. 9 No. 2 April 1, 2013 Journal of Double Star Observations Page Journal of Double Star Observations VOLUME 9 NUMBER 2 April 1, 2013 Inside this issue: Using VizieR/Aladin to Measure Neglected Double Stars 75 Richard Harshaw BN Orionis (TYC 126-0781-1) Duplicity Discovery from an Asteroidal Occultation by (57) Mnemosyne 88 Tony George, Brad Timerson, John Brooks, Steve Conard, Joan Bixby Dunham, David W. Dunham, Robert Jones, Thomas R. Lipka, Wayne Thomas, Wayne H. Warren Jr., Rick Wasson, Jan Wisniewski Study of a New CPM Pair 2Mass 14515781-1619034 96 Israel Tejera Falcón Divinus Lux Observatory Bulletin: Report #28 100 Dave Arnold HJ 4217 - Now a Known Unknown 107 Graeme L. White and Roderick Letchford Double Star Measures Using the Video Drift Method - III 113 Richard L. Nugent, Ernest W. Iverson A New Common Proper Motion Double Star in Corvus 122 Abdul Ahad High Speed Astrometry of STF 2848 With a Luminera Camera and REDUC Software 124 Russell M. Genet TYC 6223-00442-1 Duplicity Discovery from Occultation by (52) Europa 130 Breno Loureiro Giacchini, Brad Timerson, Tony George, Scott Degenhardt, Dave Herald Visual and Photometric Measurements of a Selected Set of Double Stars 135 Nathan Johnson, Jake Shellenberger, Elise Sparks, Douglas Walker A Pixel Correlation Technique for Smaller Telescopes to Measure Doubles 142 E. O. Wiley Double Stars at the IAU GA 2012 153 Brian D. Mason Report on the Maui International Double Star Conference 158 Russell M. Genet International Association of Double Star Observers (IADSO) 170 Vol. 9 No. 2 April 1, 2013 Journal of Double Star Observations Page 75 Using VizieR/Aladin to Measure Neglected Double Stars Richard Harshaw Cave Creek, Arizona [email protected] Abstract: The VizierR service of the Centres de Donnes Astronomiques de Strasbourg (France) offers amateur astronomers a treasure trove of resources, including access to the most current version of the Washington Double Star Catalog (WDS) and links to tens of thousands of digitized sky survey plates via the Aladin Java applet.
    [Show full text]
  • SEPTEMBER 2014 OT H E D Ebn V E R S E R V ESEPTEMBERR 2014
    THE DENVER OBSERVER SEPTEMBER 2014 OT h e D eBn v e r S E R V ESEPTEMBERR 2014 FROM THE INSIDE LOOKING OUT Calendar Taken on July 25th in San Luis State Park near the Great Sand Dunes in Colorado, Jeff made this image of the Milky Way during an overnight camping stop on the way to Santa Fe, NM. It was taken with a Canon 2............................. First quarter moon 60D camera, an EFS 15-85 lens, using an iOptron SkyTracker. It is a single frame, with no stacking or dark/ 8.......................................... Full moon bias frames, at ISO 1600 for two minutes. Visible in this south-facing photograph is Sagittarius, and the 14............ Aldebaran 1.4˚ south of moon Dark Horse Nebula inside of the Milky Way. He processed the image in Adobe Lightroom. Image © Jeff Tropeano 15............................ Last quarter moon 22........................... Autumnal Equinox 24........................................ New moon Inside the Observer SEPTEMBER SKIES by Dennis Cochran ygnus the Swan dives onto center stage this other famous deep-sky object is the Veil Nebula, President’s Message....................... 2 C month, almost overhead. Leading the descent also known as the Cygnus Loop, a supernova rem- is the nose of the swan, the star known as nant so large that its separate arcs were known Society Directory.......................... 2 Albireo, a beautiful multi-colored double. One and named before it was found to be one wide Schedule of Events......................... 2 wonders if Albireo has any planets from which to wisp that came out of a single star. The Veil is see the pair up-close.
    [Show full text]
  • Sky Notes by Neil Bone 2005 August & September
    Sky notes by Neil Bone 2005 August & September below Castor and Pollux. Mercury is soon ing June and July, it is still quite possible that Sun and Moon lost from view again, arriving at superior con- noctilucent clouds (NLC) could be seen into junction beyond the Sun on September 18. early August, particularly by observers at The Sun continues its southerly progress along Venus continues its rather unfavourable more northerly locations. Quite how late into the ecliptic, reaching the autumnal equinox showing as an ‘Evening Star’. Although it August NLC can be seen remains to be deter- position at 22h 23m Universal Time (UT = pulls out to over 40° elongation east of the mined: there have been suggestions that the GMT; BST minus 1 hour) on September 22. Sun during September, Venus is also heading visibility period has become longer in recent At that precise time, the centre of the solar southwards, and as a result its setting-time years. Observational reports will be welcomed disk is positioned at the intersection between after the Sun remains much the same − barely by the Aurora Section. the celestial equator and the ecliptic, the latter an hour − during this interval. Although bright While declining sunspot activity makes great circle on the sky being inclined by 23.5° at magnitude −4, Venus will be quite tricky major aurorae extending to lower latitudes to the former. Calendrical autumn begins at the to catch in the early twilight: viewing cir- less likely, the appearance of coronal holes equinox, but amateur astronomers might more cumstances don’t really improve until the in the latter parts of the cycle does bring the readily follow meteorological timing, wherein closing weeks of 2005.
    [Show full text]
  • Sky & Telescope
    Eclipse from the See Sirius B: The Nearest Spot the Other EDGE OF SPACE p. 66 WHITE DWARF p. 30 BLUE PLANETS p. 50 THE ESSENTIAL GUIDE TO ASTRONOMY What Put the Bang in the Big Bang p. 22 Telescope Alignment Made Easy p. 64 Explore the Nearby Milky Way p. 32 How to Draw the Moon p. 54 OCTOBER 2013 Cosmic Gold Rush Racing to fi nd exploding stars p. 16 Visit SkyandTelescope.com Download Our Free SkyWeek App FC Oct2013_J.indd 1 8/2/13 2:47 PM “I can’t say when I’ve ever enjoyed owning anything more than my Tele Vue products.” — R.C, TX Tele Vue-76 Why Are Tele Vue Products So Good? Because We Aim to Please! For over 30-years we’ve created eyepieces and telescopes focusing on a singular target; deliver a cus- tomer experience “...even better than you imagined.” Eyepieces with wider, sharper fields of view so you see more at any power, Rich-field refractors with APO performance so you can enjoy Andromeda as well as Jupiter in all their splendor. Tele Vue products complement each other to pro- vide an observing experience as exquisite in performance as it is enjoyable and effortless. And how do we score with our valued customers? Judging by superlatives like: “in- credible, truly amazing, awesome, fantastic, beautiful, work of art, exceeded expectations by a mile, best quality available, WOW, outstanding, uncom- NP101 f/5.4 APO refractor promised, perfect, gorgeous” etc., BULLSEYE! See these superlatives in with 110° Ethos-SX eye- piece shown on their original warranty card context at TeleVue.com/comments.
    [Show full text]
  • Binocular Double Star Logbook
    Astronomical League Binocular Double Star Club Logbook 1 Table of Contents Alpha Cassiopeiae 3 14 Canis Minoris Sh 251 (Oph) Psi 1 Piscium* F Hydrae Psi 1 & 2 Draconis* 37 Ceti Iota Cancri* 10 Σ2273 (Dra) Phi Cassiopeiae 27 Hydrae 40 & 41 Draconis* 93 (Rho) & 94 Piscium Tau 1 Hydrae 67 Ophiuchi 17 Chi Ceti 35 & 36 (Zeta) Leonis 39 Draconis 56 Andromedae 4 42 Leonis Minoris Epsilon 1 & 2 Lyrae* (U) 14 Arietis Σ1474 (Hya) Zeta 1 & 2 Lyrae* 59 Andromedae Alpha Ursae Majoris 11 Beta Lyrae* 15 Trianguli Delta Leonis Delta 1 & 2 Lyrae 33 Arietis 83 Leonis Theta Serpentis* 18 19 Tauri Tau Leonis 15 Aquilae 21 & 22 Tauri 5 93 Leonis OΣΣ178 (Aql) Eta Tauri 65 Ursae Majoris 28 Aquilae Phi Tauri 67 Ursae Majoris 12 6 (Alpha) & 8 Vul 62 Tauri 12 Comae Berenices Beta Cygni* Kappa 1 & 2 Tauri 17 Comae Berenices Epsilon Sagittae 19 Theta 1 & 2 Tauri 5 (Kappa) & 6 Draconis 54 Sagittarii 57 Persei 6 32 Camelopardalis* 16 Cygni 88 Tauri Σ1740 (Vir) 57 Aquilae Sigma 1 & 2 Tauri 79 (Zeta) & 80 Ursae Maj* 13 15 Sagittae Tau Tauri 70 Virginis Theta Sagittae 62 Eridani Iota Bootis* O1 (30 & 31) Cyg* 20 Beta Camelopardalis Σ1850 (Boo) 29 Cygni 11 & 12 Camelopardalis 7 Alpha Librae* Alpha 1 & 2 Capricorni* Delta Orionis* Delta Bootis* Beta 1 & 2 Capricorni* 42 & 45 Orionis Mu 1 & 2 Bootis* 14 75 Draconis Theta 2 Orionis* Omega 1 & 2 Scorpii Rho Capricorni Gamma Leporis* Kappa Herculis Omicron Capricorni 21 35 Camelopardalis ?? Nu Scorpii S 752 (Delphinus) 5 Lyncis 8 Nu 1 & 2 Coronae Borealis 48 Cygni Nu Geminorum Rho Ophiuchi 61 Cygni* 20 Geminorum 16 & 17 Draconis* 15 5 (Gamma) & 6 Equulei Zeta Geminorum 36 & 37 Herculis 79 Cygni h 3945 (CMa) Mu 1 & 2 Scorpii Mu Cygni 22 19 Lyncis* Zeta 1 & 2 Scorpii Epsilon Pegasi* Eta Canis Majoris 9 Σ133 (Her) Pi 1 & 2 Pegasi Δ 47 (CMa) 36 Ophiuchi* 33 Pegasi 64 & 65 Geminorum Nu 1 & 2 Draconis* 16 35 Pegasi Knt 4 (Pup) 53 Ophiuchi Delta Cephei* (U) The 28 stars with asterisks are also required for the regular AL Double Star Club.
    [Show full text]
  • Gaia Data Release 2 Special Issue
    A&A 623, A110 (2019) Astronomy https://doi.org/10.1051/0004-6361/201833304 & © ESO 2019 Astrophysics Gaia Data Release 2 Special issue Gaia Data Release 2 Variable stars in the colour-absolute magnitude diagram?,?? Gaia Collaboration, L. Eyer1, L. Rimoldini2, M. Audard1, R. I. Anderson3,1, K. Nienartowicz2, F. Glass1, O. Marchal4, M. Grenon1, N. Mowlavi1, B. Holl1, G. Clementini5, C. Aerts6,7, T. Mazeh8, D. W. Evans9, L. Szabados10, A. G. A. Brown11, A. Vallenari12, T. Prusti13, J. H. J. de Bruijne13, C. Babusiaux4,14, C. A. L. Bailer-Jones15, M. Biermann16, F. Jansen17, C. Jordi18, S. A. Klioner19, U. Lammers20, L. Lindegren21, X. Luri18, F. Mignard22, C. Panem23, D. Pourbaix24,25, S. Randich26, P. Sartoretti4, H. I. Siddiqui27, C. Soubiran28, F. van Leeuwen9, N. A. Walton9, F. Arenou4, U. Bastian16, M. Cropper29, R. Drimmel30, D. Katz4, M. G. Lattanzi30, J. Bakker20, C. Cacciari5, J. Castañeda18, L. Chaoul23, N. Cheek31, F. De Angeli9, C. Fabricius18, R. Guerra20, E. Masana18, R. Messineo32, P. Panuzzo4, J. Portell18, M. Riello9, G. M. Seabroke29, P. Tanga22, F. Thévenin22, G. Gracia-Abril33,16, G. Comoretto27, M. Garcia-Reinaldos20, D. Teyssier27, M. Altmann16,34, R. Andrae15, I. Bellas-Velidis35, K. Benson29, J. Berthier36, R. Blomme37, P. Burgess9, G. Busso9, B. Carry22,36, A. Cellino30, M. Clotet18, O. Creevey22, M. Davidson38, J. De Ridder6, L. Delchambre39, A. Dell’Oro26, C. Ducourant28, J. Fernández-Hernández40, M. Fouesneau15, Y. Frémat37, L. Galluccio22, M. García-Torres41, J. González-Núñez31,42, J. J. González-Vidal18, E. Gosset39,25, L. P. Guy2,43, J.-L. Halbwachs44, N. C. Hambly38, D.
    [Show full text]
  • The Multi-Periodicity of W Cygni
    The multi-periodicity of W Cygni J. J. Howarth The behaviour of the variable star W Cygni has been analysed from the past 89 years of BAA observations. Periods of approximately 131 and 234 days are evident, both being subject to apparently random shifts in phase and amplitude. A report of the Variable Star Section Director: J. E. Isles Introduction BAA observations from 1907 to 1918, in which they deduced periods of 129.6 days of amplitude (half peak The variable star W Cygni, RA 21h 36m 02s, Dec 45° to peak) 0.36 mag, and 243 days of amplitude 0.26 13 22' 29" (2000.0) (GC 30250, HD 205730, SAO 51079) mag. A third possible variation of period 1944 days is has been on the programme of the BAA Variable Star also mentioned. The authors refer to 'halts' in the cyclic Section since 1891. Although analysis has been under­ variations, which effectively represent sudden phase taken on some of these observations, as described shifts. In 1920 the same authors wrote a second note below, no attempt has been made to study with modern taking into account observations by Sawyer (men­ techniques the whole span of data which now extends tioned above) over the years 1885-1895. These extra to almost a century. This paper describes the computer­ observations confirmed the first two periods, but cast 14 isation of the BAA observations of W Cygni and the doubt on the third. Further 'halts' were found. subsequent analysis of the light curve. Dinsmore Alter, in 1929, applied a correlation tech­ nique to both Turner and Blagg's data and later BAA data.15 The established periods of Turner and Blagg1314 were increased to 132 and 249 days, and a further Background period of about 1100 days was noted.
    [Show full text]
  • Stars and Their Spectra: an Introduction to the Spectral Sequence Second Edition James B
    Cambridge University Press 978-0-521-89954-3 - Stars and Their Spectra: An Introduction to the Spectral Sequence Second Edition James B. Kaler Index More information Star index Stars are arranged by the Latin genitive of their constellation of residence, with other star names interspersed alphabetically. Within a constellation, Bayer Greek letters are given first, followed by Roman letters, Flamsteed numbers, variable stars arranged in traditional order (see Section 1.11), and then other names that take on genitive form. Stellar spectra are indicated by an asterisk. The best-known proper names have priority over their Greek-letter names. Spectra of the Sun and of nebulae are included as well. Abell 21 nucleus, see a Aurigae, see Capella Abell 78 nucleus, 327* ε Aurigae, 178, 186 Achernar, 9, 243, 264, 274 z Aurigae, 177, 186 Acrux, see Alpha Crucis Z Aurigae, 186, 269* Adhara, see Epsilon Canis Majoris AB Aurigae, 255 Albireo, 26 Alcor, 26, 177, 241, 243, 272* Barnard’s Star, 129–130, 131 Aldebaran, 9, 27, 80*, 163, 165 Betelgeuse, 2, 9, 16, 18, 20, 73, 74*, 79, Algol, 20, 26, 176–177, 271*, 333, 366 80*, 88, 104–105, 106*, 110*, 113, Altair, 9, 236, 241, 250 115, 118, 122, 187, 216, 264 a Andromedae, 273, 273* image of, 114 b Andromedae, 164 BDþ284211, 285* g Andromedae, 26 Bl 253* u Andromedae A, 218* a Boo¨tis, see Arcturus u Andromedae B, 109* g Boo¨tis, 243 Z Andromedae, 337 Z Boo¨tis, 185 Antares, 10, 73, 104–105, 113, 115, 118, l Boo¨tis, 254, 280, 314 122, 174* s Boo¨tis, 218* 53 Aquarii A, 195 53 Aquarii B, 195 T Camelopardalis,
    [Show full text]
  • Patrick Moore's Practical Astronomy Series
    Patrick Moore’s Practical Astronomy Series Other Titles in this Series Navigating the Night Sky Astronomy of the Milky Way How to Identify the Stars and The Observer’s Guide to the Constellations Southern/Northern Sky Parts 1 and 2 Guilherme de Almeida hardcover set Observing and Measuring Visual Mike Inglis Double Stars Astronomy of the Milky Way Bob Argyle (Ed.) Part 1: Observer’s Guide to the Observing Meteors, Comets, Supernovae Northern Sky and other transient Phenomena Mike Inglis Neil Bone Astronomy of the Milky Way Human Vision and The Night Sky Part 2: Observer’s Guide to the How to Improve Your Observing Skills Southern Sky Michael P. Borgia Mike Inglis How to Photograph the Moon and Planets Observing Comets with Your Digital Camera Nick James and Gerald North Tony Buick Telescopes and Techniques Practical Astrophotography An Introduction to Practical Astronomy Jeffrey R. Charles Chris Kitchin Pattern Asterisms Seeing Stars A New Way to Chart the Stars The Night Sky Through Small Telescopes John Chiravalle Chris Kitchin and Robert W. Forrest Deep Sky Observing Photo-guide to the Constellations The Astronomical Tourist A Self-Teaching Guide to Finding Your Steve R. Coe Way Around the Heavens Chris Kitchin Visual Astronomy in the Suburbs A Guide to Spectacular Viewing Solar Observing Techniques Antony Cooke Chris Kitchin Visual Astronomy Under Dark Skies How to Observe the Sun Safely A New Approach to Observing Deep Space Lee Macdonald Antony Cooke The Sun in Eclipse Real Astronomy with Small Telescopes Sir Patrick Moore and Michael Maunder Step-by-Step Activities for Discovery Transit Michael K.
    [Show full text]
  • Oct 2017 Newsletter
    Volume23, Issue 2 NWASNEWS October 2017 Newsletter for the Wiltshire, Swindon, Beckington Sharing the Skies Astronomical Societies and Salisbury Plain Observing Group While we have officially swapped the chair and vice chair roles I will still be editing the Wiltshire Society Page 2 newsletter. Swindon Stargazers 3 The AGM enabled us to pass over duties (ha ha ha) and I would like to thank the Beckington and Astronomy 4 society for the gift of 6 constellation wine Apollo Astronauts in UK. 4 glasses from the society. Debbie Crokker has agreed to become Cassini ends its mission 5 vice Treasurer, and details have been passed to her for tonight. Viewing Logs and Images 6-8 I have unfortunately had to help out a lot with Dark Skies Wales this last few weeks and going forward a few more weeks while Herschel Society Meeting 8 the Director Allan Trow underwent surgery Space News that has lead to more surgery being need- :Data from Opportunity shows ed. We wish him a speedy recovery. equatorial water on Mars. It means I will also be in Spain at the GEO Lunar Observer crash site found observatory while there are paying visitors New dual object found there including a journalist which means I Mystery of Moonquakes solved? Galaxy shapes give keys will miss the next event in Devizes. Rosetta lander last image viewed Also a special birthday event in Devizes Ligo gravity waves. Another found that Pete Glastonbury is helping to organ- Sub surface ice on Vesta ise. This will now be on the 14th October.
    [Show full text]
  • Interferometry & Asteroseismology of Delta Scu} Stars
    . Mode selection and amplitude limitation in pulsating stars Radosław Smolec InterferometryNicolaus Copernicus & Astronomical Asteroseismology Centre, PAS of Delta Scu Stars: 44 Tau and 29 Cyg Zhao Guo Copernicus Astronomical Center (CAMK) & Georgia State University (GSU) Jeremy Jones (GSU) Alosza Pamyatnykh (CAMK) Doug Gies (GSU) Wojtek Dziembowski (CAMK) Gail Schaefer (CHARA) Asteroseismology of Eclipsing Binaries • Gamma Dor stars Guo, Gies, & Matson 2017, ApJ, in press. • Post-mass transfer Delta Scu stars Guo,Gies, Matson, et al. 2017, ApJ, 834, 59 • Normal Delta Scu stars Guo,Gies, Matson, Garcia Hernandez. 2016, ApJ, 826, 69 • Heartbeat stars with dally excited oscillaons Guo,Gies, & Fuller 2017, ApJ, 837, 114 44 Tau Spectroscopy, Mul6-site photometry: mode ID: Zima 07 Rodler 03, Antoci 07 Seismic modeling: Lenz 08,10 Interferometry -> evolved -> Intrinsic slow rotator: Veq <= 5km/s -> Non-rotang models OK -> Solar metallicity Teff= 6900+/- 100K, log g=3.6 +/- 0.1 -> 15 frequencies, most with mode iden6ficaon 6.90 c/d 8.96 c/d CHARA: R=3.25+/-0.08 M=2.0 M=1.9 M=1.8 Z=0.02, MLT=1.8 M=1.7 Fundamental radial mode= 6.90 +/- 0.10 (c/d) 1st overtone radial = 8.96 +/- 0.10 (c/d) CHARA: R=3.25+/-0.08 M=2.0 M=1.9 M=1.8 Z=0.02, MLT=1.8 M=1.7 Fundamental radial mode= 6.90 +/- 0.10 (c/d) 1st overtone radial = 8.96 +/- 0.10 (c/d) 860 P. Lenz et al.: An asteroseismic study of the δ Scuti star 44 Tauri P.
    [Show full text]
  • Observer's Handbook 1989
    OBSERVER’S HANDBOOK 1 9 8 9 EDITOR: ROY L. BISHOP THE ROYAL ASTRONOMICAL SOCIETY OF CANADA CONTRIBUTORS AND ADVISORS Alan H. B atten, Dominion Astrophysical Observatory, 5071 W . Saanich Road, Victoria, BC, Canada V8X 4M6 (The Nearest Stars). L a r r y D. B o g a n , Department of Physics, Acadia University, Wolfville, NS, Canada B0P 1X0 (Configurations of Saturn’s Satellites). Terence Dickinson, Yarker, ON, Canada K0K 3N0 (The Planets). D a v id W. D u n h a m , International Occultation Timing Association, 7006 Megan Lane, Greenbelt, MD 20770, U.S.A. (Lunar and Planetary Occultations). A lan Dyer, A lister Ling, Edmonton Space Sciences Centre, 11211-142 St., Edmonton, AB, Canada T5M 4A1 (Messier Catalogue, Deep-Sky Objects). Fred Espenak, Planetary Systems Branch, NASA-Goddard Space Flight Centre, Greenbelt, MD, U.S.A. 20771 (Eclipses and Transits). M a r ie F i d l e r , 23 Lyndale Dr., Willowdale, ON, Canada M2N 2X9 (Observatories and Planetaria). Victor Gaizauskas, J. W. D e a n , Herzberg Institute of Astrophysics, National Research Council, Ottawa, ON, Canada K1A 0R6 (Solar Activity). R o b e r t F. G a r r i s o n , David Dunlap Observatory, University of Toronto, Box 360, Richmond Hill, ON, Canada L4C 4Y6 (The Brightest Stars). Ian H alliday, Herzberg Institute of Astrophysics, National Research Council, Ottawa, ON, Canada K1A 0R6 (Miscellaneous Astronomical Data). W illiam H erbst, Van Vleck Observatory, Wesleyan University, Middletown, CT, U.S.A. 06457 (Galactic Nebulae). Ja m e s T. H im e r, 339 Woodside Bay S.W., Calgary, AB, Canada, T2W 3K9 (Galaxies).
    [Show full text]