1959AJ. PQ LO LO ^R1 LO 1959 March

1 LO LO ^r LO 1959AJ. PQ correct. TheperiodofABAndromedaeshowsaconsiderablechangesinceOosterhoff’sphotographicobservations. effect inFresa’sobservationsofV566Ophiuchiisnotconfirmedbuttracedbacktoaperiodwhichwascompletely 358 bluemagnitudesofV566Ophiuchi,and391yellow390ABAndromedae.Theeccentricity 1959 MarchTHEASRONMICLJOURNAL65 V. P.Tsesevich(1950,1954).Photoelectricob- by C.Hoffmeister(1935,1943)andobserved during 12nightsthesummersof1955and servations madewithoutfilterwerepublished light inthemaximaofbothstarsshowsareflectioneffect(cos6term),whichhassignoppositethatexpectedbytheory. given. Thelight-timecorrection wasappliedto by A.Fresa(1954),whofoundasmalleccen- sprung (1928)andarelistedinTableII.In computed accordingtothemethodofE.Hertz- effective wavelengthof5300Â.Thecombina- corder. Thedurationofeachobservationwas a directcurrentamplifieroftheKrontype,and constant magnitudedifferencewiththecom- cording toN.G.Roman(1956),whiletheother tricity effectinhislightcurve. multiplier, theoutputofthiscellbeingfedinto The observationsweremadewitha1P21photo- make thesedataheliocentric. Thetimesofhis differential extinction.Thetimesofminimawere The checkstarwasmeasuredabouteverytwo the stars,andspectrumofvariableac- 4420 A.Duringthesenights,363yellowand358 V566 Oph Corning 3060ofthickness2.0mmwasusedfor 3384 ofthickness3.0mmwasused,havingan taken asoneminute.Ayellowfilter,Corning the amplifiedcurrentrecordedbyaBrownre- Fresa’s publicationgeocentric JulianDaysare spectral typesaretakenfromtheHDcatalogue. the bluefilter,havinganeffectivewavelengthof Flower andCookObservatoryatPaoliwasused. comp, star hours duringtheobservationsandshoweda blue magnitudeswereobtained. tion Corning5543ofthickness2.5mmand parison star. check star 1957. The28-inchreflectingtelescopeofthe Abstract. PhotoelectricobservationsarepresentedoftwoWUrsaeMajorissystems;thesecomprise363yellowand PHOTOELECTRIC LIGHTCURVESOFV566OPHIUCHIANDABANDROMEDAE This systemwasobservedphotoelectrically Table IgivestheBDnumber,positionof It wasnotnecessarytoapplyacorrectionfor V566 Ophiuchi.Thisvariablewasdiscovered Star © American Astronomical Society • Provided by theNASA Astrophysics Data System TABLE I.VARIABLEANDCOMPARISONSTARS 0 +53547 +4 3556 +4 3553 BD No. Flower andCookObservatory,UniversityofPennsylvania,Philadelphia,Pa. hms I75i57 R.A. (1900) 17 51 17 5149 +5°ooio +4 50.7 +4 23.4 D. (1900) Received November7,IQ58 By L.BINNENDIJK F4V K2 b 9 Sp. minima werecomputedaccordingtothesame additiön twotimesofminimadeterminedbyK. method andaregiveninthesametable.In Julian Day,phasecountedfromprimarymini- These elementssupersedethosementionedby are used.Aleast-squaressolutiongives: way usingourperiod.Hisnormalpointsare and Figure1givethenormalpointsafteradding mum, andthemagnitudedifference.TableIV K. Kwee(1958)fromphotoelectricobservations ence oftheblueandyellowmagnitudeatexactly changing itisimperativetocomputethediffer- mary minimaandthereisnotraceofaneccen- shown inthesamefigureandshowagoodagree- one ofthemagnitudesforthiseffect.Incase tricity effect.Inadditionthecolorcurveisgiven. minimum isexactlyhalfwaybetweenthepri- ment withourblueobservations.Thesecondary maximum. Fresa’sdataweretreatedinthesame tudes tomakethemagnitudedifferenceszeroat Kwee. the sametimeorphase,andifnecessarycorrect For thesesystemswherethelightiscontinuously minimum andshowssomereddeningduringpri- the colorcurveisunusuallyflatduringsecondary 2434179-45335 II mary minimum. .380 totheyellowand.950bluemagni- Min. I=2435245,5440+0.40964101E F =Fresa,KKwee,BBinnendijk. Table IIIgivestheobservationsinheliocentric 45I5-56393 I 6010.75340 I 5987.81291 I 5968.76551 II 5245-74938 II 4593-39559 I 4237.41775 I 4226.35716 I 4181.50086 II J. D.OMin. TABLE II.TIMESOFMINIMAANDRESIDUALS ± i5(p-e.) V566 OPHIUCHI + 1868o + O.55 — 2602.54oooo -1592 O Epoch O—C 2461 +2 2597.5 -6 2488 o 1812 —6 1765.5 +3 I782 +2 Obs. F F F B B B B F K K LO LO 1959AJ. PQ 5983.6953 5246.7208 5243.7262 2430000 + 66 5968.7316 5348.5824 JD Hel. .7496 • 7453 .7607 .7482 .7468 • 7391 .7376 .7363 .7294 . 7266 • 7350 .7279 .7253 .7197 .7182 .7169 .7154 .7099 .7071 .6996 . 7962 • 7947 .7863 .7830 .7740 .7668 .7652 .7318 .7085 .7058 .6982 .6967 .8099 . 8082 .8066 • 7995 .7978 .7879 .7846 • 7772 • 7750 .7725 .7620 .7556 .7541 .7510 .7367 .7346 .7263 . 7222 • 7499 .7456 .7414 .7359 .8051 .7636 .7526 • 7352 • 7335 .6205 .6163 .6121 . 6066 .6024 .5927 .7646 .7604 .7521 • 7457 .7388 .7332 .7278 .5968 .7910 .7896 .7854 .7840 .7785 .7770 .7729 . 7660 • 7590 • 7535 .7472 .7403 .7715 © American Astronomical Society • Provided by theNASA Astrophysics Data System Phase .0793 . 1064 .0689 .0502 .0759 .0725 .0539 .0468 .0301 .0233 .0200 .5626 .5761 .0437 .0064 .0027 .9960 .9824 .9756 .5720 .9031 .8861 .8762 . 8728 .6202 .6098 .5996 .5860 .0265 .9996 • 9572 .9538 .9502 .9468 .6090 .6050 . 5836 .5796 • 5757 • 5553 .5514 • 5474 • 5435 .5214 .5039 .4225 .6161 .6060 .0441 .0099 .9491 .9336 .9203 .9166 .9065 .8898 • 9790 .9725 .6011 • 5974 .5293 .5253 • 4999 .4765 .4728 .4691 .4652 .4304 .4268 .4180 .6263 .5924 .5822 .5585 .0407 .0000 .9966 .9830 .9796 .9695 .9661 .9525 .5177 .4960 .4920 .5687 • 5334 .0305 .0271 .0135 • 9373 + .003 — .202 + .037 + .027 + .060 -.017 + .040 + .014 -.055 -.253 — .061 — .027 — .001 — .026 — .084 -.144 — .002 Am .115 .105 .095 .076 . 160 .046 .067 .066 .085 .087 .089 .083 . 076 .088 .031 .185 . 121 .105 . 105 .076 .076 .042 . 100 .126 .133 . 186 .216 . 214 . 261 . 270 .206 . 162 . 142 .119 .028 .070 .096 .078 .199 . 189 . 180 . 121 . 016 . 022 .021 .041 .036 .094 .091 .083 .067 .086 .079 .037 .052 • 043 .027 .036 .030 .034 . 106 . 104 .253 .216 .199 .155 .119 .045 .041 .063 .070 .089 .041 .083 THE ASTRONOMICALJOURNAL 6010.6875 5983.7620 2430000 + 5987.6836 JD Hel. TABLE Ilia.YELLOWOBSERVATIONSOFV566OPHIUCHI • 7479 .7388 • 73x6 .7189 . 7062 • 7494 .7418 .7402 • 7333 • 7300 .7284 . 7222 .7173 .7110 .7094 .6923 .6907 .6889 .8386 .8038 .7205 .7078 .8399 .8372 .8357 .8247 .8232 . 8219 .8145 .8135 .8121 . 8107 .8053 . 8010 . 8204 .8025 .7961 .7948 .7935 .7789 .7921 • 7775 .7761 .7746 .7693 .7680 .7665 • 7594 .7897 .7814 .7746 .7732 .7703 .7648 .7635 .7650 .7580 .7565 .7538 .7462 • 7433 .6865 .8037 .8008 • 7995 .7940 . 7926 .7912 .7842 . 7828 . 7800 .7718 .7483 •7447 • 7X71 .7156 . 7086 .7073 .7058 .6989 .6958 .6933 .6878 .6850 .8023 .7x42 .7045 .6973 Phase .8848 .9865 • 97x8 .9644 .9469 .9429 .9237 .9158 .9119 . 8966 . 8926 .8887 .8508 .8469 . 8426 .0643 . 0612 .0205 .9965 .9931 .9901 .9678 .9508 • 9390 .9198 .8390 .0542 .0273 .0237 .0169 .0024 .9999 • 9799 .9762 .9731 .9694 .0578 • 9575 .9511 .9476 .9154 .9120 • 9544 .9084 .9050 .8920 .8889 .8852 .8816 .8680 .8646 .8609 .1403 .8541 .8408 .8358 .8321 .8287 .7408 . 7202 .7126 .6931 .6900 .6863 .6829 .2115 .1878 .1844 . 1810 .1773 .1570 .1369 .1166 .1132 .7646 . 7609 • 7575 • 7439 • 7372 .7338 .7163 .7066 . 2081 .2045 . 2011 . 1638 . 1604 .1536 .1335 .1299 .1095 + .024 -f-. 086 + .065 + .013 — .016 -.310 — .013 -.138 -.350 -.199 Am .125 . 122 . 201 . 198 .050 . 100 .071 .082 .029 .097 . 104 .205 . 207 . 296 .320 .312 .036 .084 .095 .092 .072 .074 .075 .031 .025 .077 .081 . 092 .072 .054 .068 .032 .019 .011 . 161 .165 . 172 .210 . 210 . 223 .238 .274 .281 • 375 .371 • 375 .387 • 379 .351 .352 .348 .358 .274 . 281 .288 .306 .317 .381 .366 .355 • 370 • 347 .371 .358 .346 .346 .338 .328 .315 .306 . 262 .257 •244 .227 . 202 .327 .320 .377 .363 .311 .298 6022.6089 6021.6318 6020.7408 6010.7506 2430000 + JD Hel. .7541 .6215 .6201 .6131 .6104 .7707 .7694 .7638 . 7610 .7500 .7319 .7305 . 7200 .7118 .7090 .6229 .6186 .6117 .7723 .7623 .7596 .7527 .7513 .7429 .7291 .7277 .7187 .7172 .7104 .7075 .7006 . 6993 .6979 . 6964 .6882 .7736 .7217 .6909 .6895 .6866 .6756 .6729 .6714 .6651 .6637 • 6743 .6623 .6555 .6527 .6444 .6333 .6610 .6541 .6512 .6458 .6430 .6415 .6361 .7880 .7832 .7764 • 7743 • 77X4 .7633 .7617 .7560 .7526 .7441 .7422 . 6347 .7864 .7848 .7729 .7649 • 7543 • 75X0 • 7856 .7812 .7708 .7678 • 7592 .7520 .7842 .7826 .7608 .7576 •7744 Phase .9719 .9685 • 9447 .8003 .7681 •7444 • 9752 .9648 .9515 .8950 .8918 .8783 .8746 . 8712 .8546 .8478 .8444 . 8271 .7969 .77X2 .7511 .7407 .7172 .6935 .9481 .9411 . 8989 .8678 .8512 • 7935 .7901 • 7754 .7644 .7478 .7240 . 7206 .7136 .7003 .6969 .6630 .6525 .6339 . 9020 .6898 .6596 .6562 .6373 .6305 .6070 .5596 .6271 .6138 .6034 • 5559 .4962 .4676 .4625 • 4397 .4317 .4179 .3888 .6104 .5901 .5867 .5796 .5663 .5630 .4922 .4883 • 4591 • 4555 .4137 .4097 .4058 .9966 .5833 .4843 • 4357 .3843 . 0786 .0678 .0424 .0141 .3809 .0752 .0712 .0351 .0181 .9932 .0512 .0102 + .078 + .011 — .004 + .028 — .027 + .011 + .094 -.033 — .003 + .020 —. 240 — .063 Am .067 .057 . 201 .205 •244 .263 .279 .301 .370 • 359 .366 • 377 .382 .380 .369 .359 .055 .007 .179 .250 .247 . 281 .293 .325 .363 • 377 .367 .376 .369 .360 • 359 • 359 • 354 .350 .336 .301 . 269 . 182 .367 .300 . 298 .275 .265 . 227 . 272 . 261 .215 . 204 . 209 .155 .150 .071 .063 .045 .060 .217 .117 .056 .030 .036 .017 .010 .081 .099 .141 .174 .098 .144 . 138 .149 .234 .088 . 124 .114 .084 .030 .094 .078 .059 6035.6765 6027.6421 6022.6346 2430000 + JD Hel. .6925 .6793 • 7435 .7323 .7297 .7185 .7115 .7102 .7087 .7034 . 7021 .7008 .7412 • 7399 .7329 .7308 .7293 .7093 .7057 .7043 .6967 .6954 .6939 .6807 .6779 . 7462 • 7448 .73X0 .7283 . 7226 . 7212 .7200 .7129 .6991 .6936 .6921 . 6908 .6893 .6830 .6803 .6789 • 7343 . 7078 .6818 .6733 .6719 .6692 .6601 .6587 .6704 .6615 .6573 .6462 .6448 .6435 .7270 .7256 .7227 .7041 .6972 .7242 .7068 • 7055 .7026 .6958 . 6944 . 6929 .6874 .6861 .6847 .6832 .6763 .6749 .6734 .6666 .6777 . 6680 .6637 .6576 .6548 .6533 .6388 .6361 .6652 .6561 .6401 .6374 Phase • 3777 . 8804 .8516 . 8482 . 8448 • 4755 •4484 .4419 .4385 .4246 .4145 • 3975 • 3944 .3907 .3746 .3713 .3673 • 3433 .9994 .9960 • 9790 .9740 • 9703 .9214 .9126 . 9092 . 8906 .8875 .8838 .8414 .4823 .4789 • 4450 .4212 .4181 .4009 • 3537 .3501 .3469 .3280 .3212 .3178 .9824 .9177 .3249 . 2972 . 2941 • 2754 . 2720 .2686 . 2280 .3042 .3008 .2653 .2381 .2347 .2314 . 2262 . 2191 . 1736 .2295 . 2228 . 1801 .1770 . 1699 .1587 .1533 . 1462 .1329 .1295 . 1261 . 1024 .1499 . 1225 . 1092 . 1058 .0987 .0855 . 0821 .0750 .0600 .0532 .0496 .0142 .0108 .0075 .0038 .0787 .0563 .0174 64, No.1267 + .040 + .045 + .073 + .073 —. 021 -.131 -.3x2 -.378 + .087 + .089 — .002 Am .316 .316 .048 .132 .132 .195 .199 . 206 .239 . 228 . 246 . 260 .281 .296 .080 .119 . 148 . 214 .213 .217 .312 .035 .050 . 102 .120 . 184 .273 .277 .309 .313 .316 .317 .072 .097 .152 . 206 .045 • 345 .336 .078 .338 • 349 .382 .386 .381 .376 .362 .351 • 374 • 371 .367 .324 .316 .380 • 370 .346 .343 .299 . 287 .302 .256 .235 .300 • 253 .237 .197 . 168 . 128 .089 . 196 .179 .119 .105 .033 .031 .024 .087 .116 .089 LO LO 1959AJ. PQ 1959 March 5243.7269 2430000 + 5246.7215 5968.7323 5348.S871 5983.6960 JD Hel. • 7325 .7365 .7463 .7424 .7271 .7504 .7285 .7229 .746s .7396 • 7354 .7340 .7479 .7410 .7542 .7528 .7667 .7611 • 7597 .7736 .7722 .7652 . 7860 .7847 .7791 .7778 .7916 .7903 .7358 .7342 .6170 .6074 .6031 .5977 .7675 .7643 .7516 • 7375 .6211 .6129 • 5934 © American Astronomical Society .7780 .7870 .7853 .7838 • 7747 .7731 .7659 . 7626 .7563 .7548 • 7533 .7764 • 7953 .8057 . 8001 .7985 .7969 .7886 .6988 .6974 .8105 .8090 .8073 . 7106 .7078 • 7064 . 7001 .7300 . 7272 .7203 .7190 .7175 . 7161 .7092 .7385 • 7370 . 7286 .7258 .7488 • 7474 .7460 • 7397 .7356 .7613 .7503 Phase .5778 .5643 .5877 .6216 .6115 .6021 .8745 .8915 .8881 .8779 .9084 .9051 • 9355 .9220 .9186 .9508 .9390 .9542 • 9712 .9678 .9847 .9811 .0150 .0118 .0017 .9983 .0455 .0319 .0288 .4669 .4282 .5944 .5840 • 5450 .0424 .4782 .4324 .4242 .4197 .6280 .6179 .6080 • 5707 .5602 .5313 .5273 .5231 .5191 .5056 .5016 • 4977 • 4937 • 4745 .4708 • 5491 • 5454 .5813 • 5734 • 5530 .9587 • 9553 .9485 .6070 .6028 .5988 .5853 ■ 5773 • 5570 • 9773 • 9739 .9519 .6107 .0315 .0248 .0078 .0047 .0010 .9976 .9841 .9807 .0773 .0705 .0553 .0522 .0485 .0451 .0282 .0214 . 1078 .0810 .0739 -.654 — .809 -.678 -.548 — .582 -.770 Am .695 .770 .769 .709 .846 .773 .818 .736 .764 .664 .684 .715 .623 .637 .562 .585 .487 • 477 .467 • 471 • 490 .466 .458 .478 .533 .631 .658 .798 .663 .509 .484 • 479 .522 .519 .657 . 840 .787 .748 .704 .639 .511 • 575 • SIS .514 .530 .519 .519 • 533 .689 .680 • 571 .587 .585 • 532 .531 .498 .764 .746 .677 . 670 .506 .769 • 759 .662 .469 .504 • 557 .694 .655 .625 • 577 .548 .490 .464 • 452 .470 • 445 • 457 .448 .580 .523 .504 •494 .478 • 470 THE ASTRONOMICALJOURNAL 2430000 + 5983.7626 5987.6843 6010.6881 JD Hel. TABLE Illb.BLUEOBSERVATIONSOFV566OPHIUCHI .7641 .765s .7752 .7739 .7724 .7710 .7849 . 7821 .7807 . 8001 .7946 .7918 .7904 .7835 .8030 .8015 .7932 . 7672 . 7600 .7586 .7572 •7454 .6996 . 6962 .6885 .6871 .6857 .8044 .7753 . 7686 .7656 .7551 .7489 .7469 .7176 .7149 .7093 .7079 .7065 .7051 .6980 .7940 . 792Ó .7914 • 7795 .7781 .7700 .7440 .7163 . 8060 .8044 .8031 . 8017 .7954 .7767 . 8142 .8128 .8114 .8225 . 8211 .8156 .8378 .8365 .8253 .8239 .6930 .6914 .8406 .8393 . 7069 .6895 . 7180 .7117 . 7101 .7085 .7323 .7291 . 7228 . 7212 .7196 .7583 .7527 .7513 • 7499 .7425 .7412 .7307 Phase .1149 . 1112 .1183 .1350 . 1316 .1587 . 1417 .1386 .1655 . 1621 .1553 . 2027 . 1892 . 1824 .1790 .6846 .2132 . 2098 . 2061 .1858 . 8660 .8626 .8575 .7388 .7219 .7179 .7137 .6948 .6914 .6880 .9067 .8869 .8830 . 8694 .8338 .7456 .7422 • 7354 .9525 .9135 .8903 .8423 .8375 .8304 . 7660 . 7626 • 7592 • 9779 .9745 .9711 .9559 .9491 .9460 .9168 .9101 .8937 .9982 .9815 .0050 .9948 . 0186 .0016 .0593 .0287 .0253 .0220 .8407 .0660 .0629 .0561 .9136 .8983 .8943 . 8900 .8864 .8525 .8486 .8441 .9486 .9407 .9215 .9175 .9983 .9915 • 9701 .9446 .9254 • 9949 • 9735 .0119 -.914 -.757 — .900 -•473 Am . 822 • 795 .781 .874 .847 .833 .936 .909 .906 .888 .892 .872 .812 • 939 .913 .911 • 945 .951 .936 .913 . 916 • 953 •944 • 955 .900 .946 • 937 .767 • 774 . 827 .846 . 840 .857 .884 .942 • 947 • 933 .952 .578 .714 .731 .750 .897 . 890 .486 .546 .561 .556 .683 .709 • 753 .899 • 453 .467 • 479 .491 .463 .471 .448 • 477 .469 .602 .589 • 501 .487 .632 .624 .859 .902 .885 .694 .767 .767 • 755 .666 .687 .772 • 470 .480 .480 • 495 • 572 • 579 • 594 .648 • 499 Provided bythe NASA Astrophysics Data System 6010.7599 2430000 + 6020.7415 6021.6325 6022.6096 JD Hel. . 7622 .7685 .7819 .7749 .7736 .7715 .7849 .7833 • 7533 • 7448 .7863 .7623 .7566 .7550 .7517 • 7431 .7769 • 7735 .7721 .7656 .7639 .7855 .7748 .6422 .6339 .7887 .7871 .7839 .6519 .6450 .6436 .6366 .6353 .6645 .6616 .6561 .6547 .6533 .6464 .6998 .6971 .6901 .6873 .6748 .6721 .6666 .6658 .6630 . 7096 . 7012 .6986 .6915 .6887 . 6762 .6735 .7193 .7123 . 7110 . 7082 .7325 .7311 .7297 .7283 .7224 .7210 .7179 • 7547 .7436 .7644 .7630 . 7616 .7603 • 7533 .7520 .7507 .6110 .7742 • 7729 .7714 .7701 .6193 .6137 .6123 .6221 .6207 .6234 Phase .0215 .0367 .0492 .0159 .0769 . 0729 .0695 .0526 .0441 .3826 .4154 .4114 .4075 .3905 .3866 .0803 • 4334 .4193 .4606 • 4572 .4413 .4371 .4690 .4640 . 5610 • 4979 • 4939 .4900 .4860 .5847 .5813 .5678 .5644 .5576 .6390 .6322 .6288 .6119 .6085 .6051 .5881 .7254 . 7220 .7189 .7153 .6983 .6949 .6915 .6644 .6610 .6542 .6410 .6358 .6152 .5915 .7526 • 7492 .7458 .7424 .7017 .6576 • 7949 • 7771 .7695 . 7661 .8560 .8288 . 8017 .7983 .7915 ■ 7737 .8729 . 8695 .8526 .8495 . 8461 .9034 . 8966 .8935 .8797 .8763 .9464 .9003 .9665 .9529 • 9495 .9428 .9766 • 9733 .9699 -•477 — .801 — .610 -.485 -.593 Am • 493 .523 • 495 .513 .686 .652 . 722 .647 • 555 .649 . 708 .729 • 793 .681 .549 .608 .634 . 708 .799 • 535 .546 .563 • 543 .521 .539 .547 . 706 .682 .631 .617 .848 .800 .779 .765 .765 . 722 .710 .636 .944 • 949 • 934 .941 ■ 939 .901 . 891 .879 .860 .862 .844 .842 . 827 .956 • 945 • 945 .924 .886 • 943 • 954 .954 • 934 .930 • 950 • 940 • 954 .886 .940 .926 .838 .854 .859 .764 .809 .807 .813 .831 . 760 . 822 .502 • 555 .567 .736 .746 • 499 .502 • 552 6022.6352 2430000 + 6027.6428 6035.6772 JD Hel. .6366 .6381 .6582 .6568 .6554 .6540 . 6406 .6395 .6755 .6686 . 6672 .6658 . 6644 .6866 .6838 .6769 .6741 .6964 .6950 .6936 .6880 .6852 .6783 .7276 .7234 . 7061 .7047 .7033 .6984 . 6469 .6442 . 7262 .7248 • 7075 .6823 .6712 . 6698 .6622 .6608 .6594 .6579 .6455 . 7027 .6999 .6928 .6914 .6900 .6837 .6810 . 6796 .6740 .6726 .7041 .7015 . 6942 .7136 .7122 . 7108 .7094 .7303 .7233 .7205 .7190 .7330 .7317 . 7290 .7219 .6814 .6786 .7469 • 7455 .7441 .6947 .6932 .6800 .6974 .6960 • 7335 .7099 .7085 .7065 .7050 .7404 • 7349 .7314 • 7300 .7418 Phase . 0089 . 0055 .0126 .0580 .0546 .0185 .0160 . 1038 .0835 .0801 .0614 .0512 .1479 .1309 . 1072 . 1004 .0869 .0767 . 1716 .1567 . 1512 .1342 .1275 . 1241 . 1106 . 2208 .1784 . 1750 • 1597 .2771 .2398 .2365 .2297 .2310 . 2276 . 2242 .1818 .3263 .3195 .3026 . 2992 .2958 .2737 .2704 . 2667 .2331 .3693 .3517 .3484 • 3450 .3297 .3229 .3060 .3958 • 3794 .3761 .3729 .3551 •4433 .4196 .4159 . 4026 .3992 .3924 .4501 .4467 .4402 .4263 .4230 .4772 • 8533 .8465 .8431 .4840 .4806 .8923 .8889 .8858 .8499 .9228 .9194 .9146 .9109 . 8821 • 9974 .9838 .9804 • 9753 .9720 .0008 -.459 --.946 -.857 -.485 .464 .468 .461 .467 .764 .705 .617 .603 .571 .876 .888 • 793 .752 • 744 .715 .691 .603 .889 .883 .837 . 829 . 761 .699 .909 .904 .884 . 814 .940 .942 .938 . 928 . 926 .864 .879 .908 • 949 .952 .960 .946 . 922 .836 .849 .859 .882 .909 .910 .915 .931 .932 .786 . 809 .847 .832 .867 .683 .746 .768 .765 .789 .592 .696 ■ 759 .572 .591 •644 .667 .856 .871 .524 .520 .511 • 599 • 775 .855 .672 .678 .710 .767 .782 .787 • 455 .465 .492 .667 • 474 • 470 67 LO LO 1959AJ. PQ 68 expected bythetheory. light inthemaximashowsareflectioneffect points werecomputed.Itwasfoundthatthe .OI95 (cos 6term)whichhasasignoppositefromthat .0067 .IO77 .0788 •0655 .0527 .0368 •5107 •1554 •ISIS •4734 .2112 .1789 Phase .4560 .4892 •4337 .3485 .2991 .2703 .2312 .4170 •3964 .3760 •323O The intensityandphaseangleofthenormal © American Astronomical Society • Provided by theNASA Astrophysics Data System + .466 + -Oil + .420 + .038 — .001 •463 •425 •364 •322 .078 . 128 . 184 .264 .044 •415 •373 .012 .416 .3OI •247 . 184 .098 .066 •I39 Figure I.Thelightcurvesand color curveofV566Ophiuchi.Thecrossesrepresent 10 10 10 8 7 6 6 4 4 4 6 8 8 6 6 6 4 6 8 8 8 6 8 8 Yellow THE ASTRONOMICALJOURNAL .5609 •5434 •5998 •5853 •5753 Phase •9799 .9709 .9562 •7147 .6893 .6578 .6292 .6103 .9961 .9472 •9363 •9163 .9017 .8885 •8755 •8531 •8377 •7825 •7489 TABLE IV.NORMALPOINTSOFV566OPHIUCHI + •374 + .465 Am normal pointsofFresa’sobservations. .200 .241 .272 .326 .O32 •US .171 •45I •405 .318 .Oil .OO3 .021 .086 .470 .365 •249 .220 .170 •I34 .085 .065 12 10 11 ii 11 10 10 10 10 10 10 10 6 6 6 6 6 6 4 6 7 6 6 8 lished spectrographicobservations. Heard atDavidDunlapObservatoryhasunpub- unpublished photoelectricobservations;J.F. Purgathofer attheViennaObservatoryhave C. E.WorleyatLickObservatoryandA. •0383 .0211 .0671 .OO83 Phase .IO93 .0803 •0537 . 1802 •1571 •I33O •3778 •3501 .3246 .3009 .2720 .2330 .2128 .4909 •4751 •4576 •4349 .4186 .3980 •5124 + .486 + .422 .469 .068 .I84 .258 .318 •375 •445 .O42 . I27 .I47 .IO3 •O39 .002 .012 .OIO •39I .260 . I90 .077 •425 •427 •323 10 10 10 8 4 4 4 4 6 6 8 8 8 8 8 6 8 6 6 6 6 6 8 8 Blue .5468 .6017 •5770 .5626 .6909 .6323 .6120 .5869 Phase .8902 .7171 •6593 •9034 .8548 •8393 .7841 •7504 •9573 •9494 .9380 .8771 •9977 .9808 •9725 .9180 64, No.1267 + + 319 008 039 071 386 096 075 012 001 245 270 419 338 212 479 486 462 379 269 106 191 186 169 146 10 10 10 10 10 10 10 10 10 10 11 6 6 4 6 6 7 7 6 6 9 6 8 7 1959 March THE ASTRONOMICAL JOURNAL 69

AB Andromedae. This system was discovered TABLE VI. TIMES OF MINIMA AND RESIDUALS OF AB ANDROMEDAE by P. Guthnick and R. Prager (1927). The variable was observed photoelectrically during the J. D. O. Min. O-C Meth. Obs. Ref. fall and winter of 1957 during nine nights. The 2416103 •925 II + 4 000 Pg He 1 8684 •SIS I .004 Pg Sh 2 same instruments were used and the same tech- 8963 •633 I .009 Pg Sh 2 nique was followed as before. A total of 391 24760 .360 I .006 Pg G, P 3 5276 •4445 I .0074 Pg Jo 4 yellow and 390 blue magnitudes was obtained. 5502 . 1267 I .0068 Pg Oo 2 Table V gives the information about the BD 5873 •5073 I .0064 Pg Oo 2 numbers and position of the stars. The spectrum 6216 •1793 II + .0056 Pg Oo 2 9523 •583 I — .006 Pg Wo 5 of AB Andromedae is that given by O. Struve 9550 .6312 II .0060 Pg Oo 2 and collaborators (1950), who give the radial 9907 •7398 II .0072 Pg Oo 2 velocities. 30257 .8803 II .0070 Pg Oo 2 061I •8379 I .0063 Pg Oo 2 No correction for differential extinction was 0962 •645 I -.003 Pg Wo 5 necessary. Times of minima were then computed IO46 .615 I .000 Pg Wo 5 I350 •4580 II +.0004 Pg Oo 2 and are listed in Table VI. In addition normal 1707 .9018 II .0025 Pg Oo 2 points of earlier observations are given ; the 0 — C 2133 .0469 II .0010 Pg Oo 2 are computed with OosterhofFs (1950) formula, 2413 .1603 II .0022 Pg Oo 2 2793 .671 I .005 Pg Wo 5 who made many accurate photographic deter- 3207 .3684 II .0059 Pg Oo 2 minations of the minima times. 3886 •578 I .Oil v D,J 6 4264 .600 I .013 V As 7 Min.I = 2425502.11989 + 0.331886486 E 5075 .407 I .021 V Sz 8 5370 .460 I .027 V Sz 9 Our observed minima occur about 50 minutes 5782 •336 I •033 V Sz 10 later than expected from this ephemeris and con- 6069 .421 I •OSS V S, G 11 6IO9 •57835 I •0345 pe Bi firm the recent visually observed times of minima 6124 .68008 II •O354 pe Bi of this system. (See Figure 2.) The new formula 6132 .64609 II + .O36I pe Bi used for determining the phases is : He = Hertzsprung, Sh = Shapley, G, P = Guthnick and Prager, Jo = Jordan, Oo = Oosterhoff, Wo = Woodward, Min. I = 2436109.57835 + 0.33188940 E D, J = Domke and Jahn, As = Ashbrook, Sz = Szafraniec, S, G = Satanova and Grigorevsky, Bi = Binnendijk. TABLE V. VARIABLE AND COMPARISON STARS i = Hertzsprung 1928; 2 == Oosterhoff 1950; 3 = Guth- Star BD No. R.A. (1900) D. (1900) Sp. h m s nick and Prager 1927; 4 = Jordan 1929; 5 = Woodward AB And +36°5°i7 23 6 46 +36°2IÍi G5 1951; 6 = Domke and Pohl 1952; 7 = Ashbrook 1952, comp, star +35 4972 23 6 54 +36 7-9 1958; 8, 9, 10 = Szafraniec 1955, 1956, 1957; 11 = Sata- check star +35 4979 23 7 47 +36 8.5 nova and Grigorevsky 1957. 1900 1920 1940 Year I960

Figure 2. Period variation of AB Andromedae. Visual normal points are small dots, photographic observations large dots, photoelectric data squares.

© American Astronomical Society • Provided by the NASA Astrophysics Data System LO LO 1959AJ. PQ 6109.S382 70 2430000 + 6115.5556 6124.5161 JD Hel. • 5753 • 5737 .5650 .5636 .5426 • 5397 .5858 .5844 .5828 .5768 .5719 .5665 .5621 .5529 .5487 .5412 .6111 • 5957 .5941 .5872 .5515 .5503 .6158 • 5990 • 5973 .6387 .6358 .6143 .6128 .6906 .6893 .6817 .6800 .6584 .6510 .6494 .6403 .6372 .6300 .6286 .6272 .6258 . 7066 .7051 .7036 .6921 .6876 .6787 .6705 .6691 .6676 .6661 .6601 .6567 .6476 .6460 .7182 .7154 .7140 .7083 .6772 .7287 .7271 .7256 .7240 .7168 .5571 .7489 .7471 • 7393 • 7377 .7361 .7302 .6328 .6314 .6235 .6220 .6044 .6028 .5918 .5903 .5814 • 5759 .5669 .5653 • 7502 .7457 .6477 .6458 .6400 .6384 .5830 • 5745 .5193 .5177 © American Astronomical Society • Provided by theNASA Astrophysics Data System Phase .8836 .8791 .8923 .9861 • 9555 .9234 .9108 .8882 .0182 .0134 .9952 .9907 .9806 .9642 .9596 .9509 .9192 .9154 .0475 .0224 .0988 .0569 .0524 .0266 . 1127 .1037 . 0622 . 1082 . 2187 .1818 .1773 .1731 .1556 .1431 .3342 .3063 . 2690 .2645 .2463 .2362 . 2142 .2037 . 1867 .1515 .1473 • 3774 .3293 .3115 .3025 • 2979 .2777 .2735 .2410 .2086 .4088 .3865 .3819 .3429 .3384 • 4531 •4437 .4388 .4214 .4172 .4130 .3917 . 2422 .2381 . 2098 .1143 .0710 .0142 .5138 .5085 .4803 .4482 .2594 .2143 . 1568 .1519 .1188 .0923 .0874 .0668 .0438 .0390 .0096 .5179 .5044 . 4848 •4754 .4576 . 2872 . 2642 .0179 .0130 .0082 .2817 -.275 + .128 —. 107 + .018 —. 218 + .026 + .346 + .188 + •355 + .367 — .011 — .013 Aw .272 .143 .245 .258 .360 .141 . 162 .383 • 372 .366 .346 . 241 .197 .141 .371 . 126 .320 • 330 .087 .047 . 272 . 260 . 240 .401 • 349 • 349 .336 . 287 .383 .388 • 445 •449 .436 .436 .402 • 373 .358 .165 • 197 . 221 .288 . 287 .305 .386 • 394 .421 .414 .420 .413 • 455 • 452 • 451 •449 •440 .436 • 433 .386 .030 .086 .186 • 444 .446 .338 .232 .187 .174 .149 .033 .340 .424 • 430 • 447 • 443 .412 .426 .275 .244 .055 .214 .388 . 217 .215 • 352 • 174 .143 .199 THE ASTRONOMICALJOURNAL TABLE Vila.YELLOWOBSERVATIONSOFABANDROMEDAE 6124.5207 2430000 + 6125.5186 JD Hel. .5283 .5267 .5315 .5298 • 5388 • 5371 • 5471 .5417 .5403 • 5500 .5486 .5612 .5584 • 5568 • 5515 • 5730 .5600 .5904 .5888 .5783 .5765 .5746 .6964 .6885 .6804 .6789 .6663 .6647 .6564 .6549 .6517 .6448 .6415 .6399 .6283 .6031 .6000 • 5943 • 5933 .6994 .6978 .6913 .6899 .6869 .6774 .6677 .6631 .6535 .6429 .6267 .6251 .6162 .6134 .6120 .6049 .6015 .7089 .7076 . 7010 .6760 .5830 • 5797 • 5783 . 5666 .5648 .5631 .5519 • 5349 • 5334 .5229 .5215 • 7391 •7346 • 7293 • 7123 .7105 .5200 • 7375 .7361 .7279 .7249 .5915 • 5901 • 5885 .5813 .5613 • 5552 .5503 .5446 • 5431 .5416 .5402 .5299 .5283 • 5994 • 5930 Phase .0497 .0403 .0221 • 0545 .0451 . 1016 .0811 .0765 .0716 • 1103 .0852 .1442 .1403 .1309 .1149 . 1061 • 2439 . 2272 .1958 . 1902 . 1846 .1798 .1358 .4169 • 3959 .3862 .3813 • 3464 • 2757 .2704 .2655 . 2610 .2407 .2320 • 5557 .5515 • 5320 .5278 • 5034 .4988 • 4943 .4608 • 4559 .4511 .4308 .4263 .4221 .3904 .3416 .3367 .3098 • 2973 .5606 .5361 .5229 .4901 .4650 .3015 .6802 • 5941 .5892 • 5853 .5655 .0330 .0288 • 6753 .6666 .6505 .6463 .6373 • 5993 . 1027 .0940 .0780 • 0735 .0417 • 0375 .6711 . 2088 . 1680 . 1627 • 1575 • 1390 .1293 .1244 • 1073 .0982 .0630 .0581 .2443 . 2227 . 2178 .2130 .1736 .2485 .2394 .2530 . 2722 + •317 + .062 — .076 + .021 + .IO6 + .276 — .021 — .128 + .OO4 -.388 — .080 -•439 Aw . 109 .186 .125 .140 • 339 .247 . 229 • 153 .092 .426 .426 .401 • 337 .325 .317 .271 .235 • 434 • 435 • 449 .444 .440 .418 • 407 .385 .407 • 395 • 434 • 441 .441 • 300 .313 .315 • 370 • 374 • 054 .I3O • 154 • 223 . 212 .210 .082 .062 .000 . 160 .208 .303 .083 .O69 .O96 • 197 .328 • 205 . 196 . I84 .158 • 195 .156 .202 .232 .360 •349 . 292 .288 . IOS • 037 • 357 • 318 • 254 .236 . 220 .204 .402 .403 .385 .364 • 357 .369 .361 • 312 .422 •454 •442 • 459 • 451 •447 6132.5285 6125.6011 2430000 + 6155.5777 6163.5495 JD Hel. .5319 • 5334 • 5559 .5504 .5488 • 5471 • 5455 • 5302 • 5735 .5684 .5672 .5656 .5640 • 5588 • 5574 .5828 .5761 • 5750 .5925 .5859 .5843 • 5775 .6122 .6025 • 5970 .5956 • 5941 • 5873 .6244 .6136 .6069 .6055 .6041 .6809 .6726 .6710 .6643 .6626 • 6555 .6539 .6526 .6435 .6422 .6406 .6351 .6335 .6318 .6261 .6217 .6164 .6150 .6859 .6828 • 6755 .6741 .6658 .6613 .6511 .6452 .6231 .7099 .7069 .6955 .6941 .6927 .6913 .6842 • 5791 .7111 .7084 .6077 .6064 .6050 .5819 .5805 .6269 .6241 .6227 .6159 • 6145 .6130 .6035 .5536 • 5524 .6256 .6172 .5631 .5603 • 5590 • 5509 .5687 .5618 • 5714 • 5701 Phase .2774 . 1601 . 1500 .2326 .2110 . 1646 • 1552 .2664 .2619 .2413 .2372 .2159 . 2061 . 2012 .3135 . 2902 .2856 .2703 .2570 .3181 • 2975 .2933 .3428 • 3271 .3229 .4021 .3861 .3728 .3564 • 3522 • 3477 • 4391 .4063 .3819 • 3777 .5887 .5842 • 5793 .5636 • 5590 • 5541 .5326 .5277 .5238 .4966 .4663 .4440 • 4349 • 4307 .4147 .4105 .6243 .6190 .6148 .6093 • 5929 • 5500 .5193 • 5015 .4924 .4879 • 4712 .4614 .6964 .6874 .6532 .6490 .6449 .6407 .6027 .5985 .7003 .6919 .6850 .6808 .6110 .6069 .6265 • 7467 .7383 .7341 .7136 • 7094 .7048 .6888 .6762 .6303 .6220 .6178 .7428 • 7X74 • 6589 .6506 .6464 .6757 .6551 .6840 .6798 -•447 -.330 + .009 + .046 -.035 — .060 —. 219 -.254 -.388 Aw .398 • 441 .409 .416 .406 • 356 • 337 • 343 • 435 .441 • 437 .401 .417 .411 .426 • 439 .422 .411 .419 • 439 .424 .365 • 354 .378 .386 .239 • 277 • 295 • 305 .325 .402 • 137 .084 . 162 .069 .118 .206 .211 • 243 • 244 .250 .225 • 195 .187 . 162 .027 .123 . 189 • 179 .209 . 190 • 095 . 129 . 161 .387 .316 .314 • 293 . 260 . 228 .217 .228 .376 .363 . 289 • 407 • 379 .268 .249 • 391 .287 .462 • 450 .381 • 374 • 370 . 292 .258 .448 .467 • 430 .416 • 397 .338 • 339 .341 .338 • 375 .386 6163.5728 2430000 + 6172.5344 6174.5342 JD Hel. .5811 .5796 .5782 .6055 .6041 .5988 • 5974 .5946 .5823 .6175 .6161 .6147 .6133 .6083 .6069 .5960 .6340 .6326 .6272 .6259 .6245 .6231 • 6367 • 5372 .6353 .5665 .5585 • 5570 • 5556 .5541 .5486 • 5471 • 5456 • 5441 • 5387 • 5359 .6103 .6088 .6074 .6059 .6001 .5986 • 5957 • 5900 . 5803 • 5788 • 5774 .5762 .5748 .5692 .5678 .5650 .6189 .6174 .6159 • 5974 • 5887 .5873 .5859 • 5440 .6205 .5580 • 5537 • 5469 • 5454 .5385 • 5370 .6013 .5781 .5683 .5655 .5634 • 5565 • 5551 .5483 .6110 .6095 .6040 .6027 • 5943 .5929 .5898 .5767 • 5752 .5738 .5669 .6211 .6139 .6124 • 5998 .5914 .6194 .6226 . 6240 Phase .6882 64, No.1267 .7085 .7043 .7663 .7622 .7580 .7538 . 7168 .7130 .8145 .8103 • 7949 • 7907 . 7866 .7824 .8521 .8438 .8396 . 8228 .8186 .8807 .8765 .8724 . 8682 .8480 .7027 .6982 .6898 .8879 .7578 • 7491 .7327 .7282 .7236 .7191 .6944 . 9098 .8834 .8795 • 8747 .8572 • 8534 .8283 .8237 . 8196 .8115 .7948 .7906 .7864 .7819 .7624 .7536 .7155 • 9399 • 9353 .9186 .9140 • 9053 .8492 .8450 .8157 .7239 • 9493 • 9444 .7870 .7825 .7783 .7741 • 7535 • 7490 .7448 .7284 .8477 . 8348 . 8180 .8097 .8034 • 7577 .9467 .9422 .9258 .9216 .9174 .8965 • 8923 .8829 .8435 .8390 .8139 .9722 • 9554 • 9509 .9129 .8878 • 9771 .9816 .9858 — .380 + .020 + .096 -.398 -.413 — .114 + .014 — .090 + .371 Aw • 417 .410 • 431 .423 .410 .425 • 430 • 444 • 431 .423 .413 .405 .4X3 .403 •424 .428 .317 .326 • 339 .346 .363 .386 .386 .398 .418 .416 .416 •443 • 443 • 430 .141 • 174 . 271 .285 .288 . 291 • 340 .382 • 391 .412 .426 • 434 .440 .428 .441 • 446 •449 .441 .436 .424 .072 .048 • 195 • 342 • 351 .362 .405 .411 .441 • 431 •434 • 439 • 435 .458 • 455 • 450 • 432 .407 .419 .416 .050 .103 .259 .281 • 345 • 375 .389 .416 • 139 .158 • 244 . 262 .367 .325 . 126 .089 . 269 • 353 LO LO 1959AJ. PQ 6124.5168 6115.5563 6109.5390 2430000 + 1959 March JD Hel. .5214 .5184 .5200 .6484 .6465 .6407 .6391 .6336 .6319 .6250 .6227 .6051 .6035 .5924 • 5910 .5836 .5819 .5766 • 5753 .5676 .5660 .5576 .7496 .7480 .7464 .7401 .7386 .7369 .7309 .7295 .7278 .7263 .7247 .7189 .7175 .7074 .7147 . 7092 . 7161 .7058 .7043 .6928 .6913 .6899 .6886 .6825 .6808 .6779 .6793 .6713 . 6696 .6668 .6684 .6608 .6592 .6574 .6518 .6483 .6467 .6500 .6411 .6395 .6379 .6365 .6279 .6307 .6293 .6265 .6166 .6150 .6136 .6119 .5996 • 5979 .5964 .5948 .5879 .5864 .5850 .5835 • 5775 • 5759 .5742 .5728 .5670 .5656 .5643 .5629 .5536 .5521 .5508 • 5495 • 5433 .5419 .5403 © American Astronomical Society • Provided by theNASA Astrophysics Data System .0242 .0200 .0152 .0103 .2893 .2837 .2663 . 2614 .2447 . 2189 .2398 . 2119 .1589 .1540 . 1206 . 1164 .0940 . 0892 .0731 .0693 .0459 .0410 .0159 .0117 .5113 .5159 .5064 .4873 .4827 .4778 • 4597 • 4555 • 4503 • 4458 .4409 .4235 .4193 .4151 .4109 .3941 .3889 .3840 • 3795 • 3450 .3404 .3363 .3321 .3140 .3087 .3042 . 2801 .3000 .2749 .2665 .2714 . 2484 .2435 .2383 . 2212 .2159 . 2107 .2058 . 1891 . 1842 .1793 Phase .1752 .1535 .1577 .1494 .1452 . 1152 . 1061 . 1012 .0496 .0287 .1103 .0639 .0590 • 0545 .0242 .0200 .0155 .9928 • 9973 .9875 .9833 .9659 .9209 .9617 .9575 • 9534 .9255 .9171 .9129 .8854 .8945 .8903 .8815 + .391 + .412 -•403 + .O52 + .44O — .008 + .021 — .027 + .056 — .208 + .200 — .048 — .240 .415 .397 .405 .416 .405 .404 .414 .389 .402 .339 .322 .251 • 225 •I33 . IO9 .284 •233 .280 .446 .238 . 28O •293 .263 .206 .O84 .075 .O4I • 135 . no .138 .152 .226 . 242 .255 .258 • 345 .348 • 357 • 357 Am .392 .406 .400 • 439 .405 .442 •445 •449 • 453 • 450 .438 .422 • 435 .417 .406 .381 • 378 .363 • 357 • 339 .342 .325 .310 .249 .234 .213 .118 .147 .416 .083 .362 .396 .442 .430 .301 • 432 •434 .407 . 271 . 229 .089 .097 .105 . 198 . 218 .231 THE ASTRONOMICALJOURNAL 6125.5193 6124.5274 2430000 + JD Hel. TABLE Vllb.BLUEOBSERVATIONSOFABANDROMEDAE • 5937 .5922 .5908 .5892 .5837 .5820 .5804 • 5790 .5676 .5656 .5638 .5621 • 5559 .5541 .5525 • 5510 • 5452 .5438 .5422 .5410 • 5355 • 5341 .5306 .5290 .5235 .5221 .5207 .7398 .7367 .7383 • 7353 • 7300 . 7286 .7270 .7256 .7131 . 7112 . 7096 . 7082 . 7022 .7001 .6985 .6971 .6906 .6892 .6876 .6811 .6797 . 6782 .6767 .6684 .6670 .6654 .6638 .6571 .6554 .6541 .6524 • 6455 .6436 .6422 .6406 .6290 .6274 .6258 .6169 .6141 .6126 .6110 .6054 .6037 .6006 .6022 • 5950 .5938 .5911 .5895 • 5790 • 5773 .5756 .5619 • 5737 • 5591 .5605 • 5575 .5522 .5507 • 5492 .5478 .5422 .5410 • 5395 .5378 .5323 .5304 .5290 .2506 .2464 .2415 .2551 . 2248 .2199 .2150 . 2108 .1763 .1674 . 1648 . 1600 . 1411 .1359 . 1310 . 1265 . 1090 .1049 . 1000 .0961 .0798 .0393 .0756 .0651 .0602 .0435 .0351 . 6822 .0309 .6777 .6728 .6687 .6526 .6436 .6484 .6394 .6017 .5961 .5913 .5871 .5689 .5627 .5536 .5578 .5340 .5298 .5250 .5054 .5013 .4967 .4922 .4671 .4629 .4580 .4281 ■ 4532 ■ 4329 .4239 .3981 .4190 .3925 .3883 .3834 .3485 .3436 .3388 .3119 .3036 . 2990 .2941 Phase .2774 . 2722 . 2676 . 2628 . 2460 .2425 .2341 .2293 .1978 .1927 .1874 .1463 .1818 • 1379 . 1421 .1330 . 1170 .1124 .1037 .1079 .0831 .0870 .0786 • 0737 .0570 .0514 .0472 .0423 -•444 + .032 + .321 -.043 -.356 + .020 — .023 + .060 — .061 + .098 +. 242 -.039 .419 .438 • 435 .408 • 394 .438 .386 • 352 ■ 333 • 340 • 335 .328 .306 .303 . 291 . 222 . 208 .203 . 180 .059 .065 .188 .237 . 267 • 330 • 344 .329 .279 . 180 .303 .302 .276 .163 . 150 • 174 .061 .000 .159 .182 .200 . 289 . 284 .294 Am .273 .159 .132 . 102 .097 .115 .231 . 140 . 241 .244 .263 • 337 .342 .381 .362 .379 .411 .396 .420 .429 .419 .421 • 437 .423 • 437 .418 .417 .413 • 397 .398 .321 .312 .303 .289 .253 .225 .203 .197 . 121 .086 .064 . 160 .179 6163.5502 6I55.5784 6132.5293 6125.6003 2430000 + JD Hel. .5722 .5708 .5694 .5638 .5625 .5610 .5596 • 5543 .5529 .5516 .6277 .6262 . 6248 .6234 .6179 .6166 .6152 .6137 .6084 .6070 .6056 .6042 .5826 .5812 .5798 .7117 .7104 .7092 .7076 .6962 .6948 .6934 .6920 .6867 .6851 .6835 .6816 .6761 .6747 .6733 .6717 .6663 .6650 .6633 .6620 .6547 .6532 .6518 .6562 .6461 .6441 .6427 .6413 .6358 .6342 .6325 .6268 .6251 .6170 .6224 .6156 .6143 .6129 .6237 .6075 .6062 . 6048 .6032 .5976 .5962 . 5948 .5932 .5879 .5866 .5851 • 5835 .5782 • 5768 .5742 .5691 .5677 .5663 • 5647 • 5594 .5580 .5566 • SSII • 5495 .5478 . 5462 . 5339 .5325 • 5309 .6017 .6861 .6819 .6778 .6572 .6610 .6527 .6485 .6324 .6283 . 6241 .6199 • 7491 .7446 .7404 .7195 .7362 .7157 .7115 .7070 . 6867 . 6909 .6824 .6784 .6131 .6090 .6048 .6006 . 7020 .6982 .6944 .6895 .6553 .6511 .6469 .6427 .6267 .6218 .6170 .6113 • 5946 .5904 .5862 .5814 .5653 .5612 .5563 .5521 .5346 .5301 .5256 .5214 .5043 .4984 .4942 • 4732 .4900 .4683 .4635 .4461 .4412 .4328 .4168 .4126 .4084 .4042 • 4370 .3881 .3840 .3798 • 3749 .3582 .3540 Phase .3498 .3449 .3289 .3250 .3205 .3156 .2996 . 2954 .2877 .2724 . 2682 . 2640 .2591 .2431 .2389 .2347 . 2180 .2131 . 2082 . 2034 . 1664 . 1622 .1573 .1524 .2792 .2750 -.364 — .232 -.183 + .023 —. 004 + .007 — .042 -.305 -•437 .368 ■ 355 .308 .308 .314 .314 .277 .249 . 242 .415 • 437 • 437 • 437 .407 .386 • 393 • 378 • 343 .364 • 357 • 359 .233 . 196 .203 .368 • 372 .359 • 357 .292 .285 . 262 .255 .230 .217 .205 .183 .151 .151 . 121 .112 . 040 .062 . 162 . 196 .234 . 229 .272 Am .286 .268 .263 .158 .138 . 102 .097 • 149 .053 .152 .195 . 189 .244 .268 .255 .288 .315 .319 .332 • 345 .362 .362 .380 .391 .385 .378 .403 .429 .414 • 435 .417 • 435 .415 .405 .386 .364 • 399 • 373 .329 .316 .322 .420 6I74.5350 6172.5351 6163.5735 2430000 + JD Hel. .6245 .6218 .6201 .6231 .6147 .6131 .6116 . 6102 . 6046 .6032 .6018 .6005 .5950 • 5936 • 5921 . 5905 .5787 • 5773 .5759 • 5745 .5690 .5676 .5662 .5648 • 5586 • 5572 .5558 •5544 • 5490 .5475 .5461 • 5447 .5391 • 5378 .5363 .6213 .6181 .6196 .6166 .6110 .6094 .6080 .6066 . 6008 • 5993 .5979 .5964 . 5906 . 5893 .5879 .5865 .5795 .5782 .5767 • 5754 . 5699 .5684 .5672 .5656 .5592 • 5577 .5548 • 5492 . 5563 • 5479 . 5464 .5448 . 5393 • 5379 .5365 .6360 .6374 .6346 .6333 .6279 .6265 .6252 .6238 .6182 .6168 .6154 .6140 .6089 .6076 .6062 .6048 .5995 .5981 .5967 ■ 5953 .5830 .5816 .5803 .5789 .9875 .9833 ■ 9192 .9743 • 9579 • 9530 .9485 • 9443 .9275 .9234 .9192 .9150 .8986 .8944 .8899 .8850 .8494 .8453 . 8410 . 8368 . 8201 .8159 .8117 .8076 .7888 .7846 .7804 .7762 . 7598 • 7553 .7511 .7469 .7302 .7263 . 7218 .7176 .9517 .9465 .9419 • 9374 .9158 .9207 .9116 .9074 .8900 .8854 .8813 .8767 .8593 .8551 .8509 . 8468 .8258 . 8216 .8174 .8133 .7969 .7885 .7923 .7840 .7644 • 7599 .7512 • 7345 .7306 • 7557 . 7261 Phase . 7212 .7045 .7003 .6961 .6919 .8828 .8786 .8744 .8703 .8542 .8500 .8459 .8207 .8417 .8249 .8165 .8124 . 7970 . 7928 .7887 .7845 .7684 .7643 . 7601 . 7559 .7189 .7147 .7105 .7063 .6903 + .463 + .083 -.031 + .159 + .088 -.398 — .063 -.369 -.367 .432 . 224 .427 .363 .186 .133 .048 .086 . in • 194 .223 . 212 .239 .310 • 331 .340 .346 ■ 351 ■ 350 .366 ■ 310 .404 .426 .422 . 428 • 439 • 437 • 433 .429 .416 .398 .416 .146 .098 .090 .119 .136 .217 .236 .238 . 246 .320 Am .320 .327 .326 ■ 311 • 391 .386 .381 .390 .422 .426 .407 .424 .432 .431 .411 .415 .408 .417 .408 • 390 .361 .384 .275 .275 .295 .295 .313 .342 .348 .358 .356 .363 .362 .362 .389 • 393 .381 .421 .403 .417 .417 .415 .383 .389 .381 .387 71 1 LO LO ^r LO PQ

1959AJ. : 72 .0568 .0214 .OII7 .0456 •0357 Phase .0692 .0816 .1230 •2393 .2187 .1496 .1013 .2718 .2560 •2935 .1996 .1699 .3209 .4208 .4107 •3933 .3807 .3462 •4349 .4601 .4480 a m LO © American Astronomical Society • Provided by theNASA Astrophysics Data System .4 .2 .0 .8 .6 + .808 + .492 .782 •493 .587 .665 •399 •319 .069 . 100 .149 .028 .216 .001 .019 .000 .000 •037 .021 .227 .158 .142 .069 .428 •319 .260 10 10 IO IO IO IO IO IO IO IO IO 5 5 5 5 5 5 5 5 8 5 5 5 5 5 8 Yellow THE ASTRONOMICALJOURNAL Phase 4923 4756 5383 5209 5033 6991 6577 6309 6019 5806 5586 6826 9879 7180 7878 7624 7419 9707 9210 9114 9524 9417 8135 8876 8378 8662 TABLE VIII.NORMALPOINTSOFABANDROMEDAE + .578 + .OI9 + .OO3 — .OO6 + .807 .665 .520 .626 .647 .386 .298 .167 .O4I .065 .IO5 .221 .OI3 .062 .174 .O32 .719 •327 .281 .II7 •559 •484 IO IO IO 10 10 IO IO IO IO 11 IO 10 IO 6 6 5 5 5 5 5 6 5 5 5 6 5 .0589 •0475 •0377 .0234 .OI37 .0710 .2210 .2018 •1517 ,1290 •0835 Phase . 1718 •IO33 •2413 • 2738 .2581 .3827 •3232 • 2957 .4228 .4128 • 3956 • 3481 .4502 •437O .4622 +•855 + .826 SH 699 429 611 017 034 080 004 342 001 230 056 032 000 095 106 ISS 311 471 374 273 204 171 546 10 10 11 10 10 10 10 10 10 10 10 5 5 5 5 5 5 5 8 8 5 5 5 5 5 5 Blue .5408 •5236 •5057 •4943 .5607 •4779 .7204 .7011 .6340 .5828 .6040 .7440 .6846 .6598 Phase .8408 •8157 .7898 •7645 .8896 .8682 •9729 •9437 .9228 •9133 •9547 •9897 64, No.1267 +.631 + .869 •547 .421 .658 .714 .707 .030 •055 •311 .002 .071 .117 .174 •243 .026 .007 .206 •143 .087 .061 •540 •369 .320 .785 .630 c Y B 10 10 10 11 10 10 10 10 10 10 10 10 10 5 5 5 5 5 5 5 6 6 5 5 5 5 1959 March THE ASTRONOMICAL JOURNAL 73

Table VII gives the observations, namely helio- REFERENCES centric Julian Day, phase counted from primary V566 Ophiuchi minimum, and magnitude difference. Table VIII Fresa, A. 1954, Mem. Soc. Astr. Ital. 25, No. 2 ; Contr. Astr. Napoli (Capodimonte)f Serie II, 4, No. 14. and Figure 3 give the normal points after adding Hertzsprung, E. 1928, B. A. N. 4, 179. .443 to the yellow and .430 to the blue magni- Hoffmeister, C. 1935, A. N. 255, 401. . 1943, Kleinere Veröff. Berlin-Babelsberg No. 28, 81. tudes to make the magnitude difference zero at Kwee, K. K. 1958, B. A. N. 14, 131. maximum. The color shows a reddening during Roman, N. G. 1956, Ap. J. 123, 246. Tsesevich, V. P. 1950, Astr. Cire. U.S.S.R. No. 100, 18. both minima, where again the difference of blue . 1954, Izvestia Astr. Obs. Odessa 4, Part II, 236. and yellow magnitude was considered at the AB Andromedae same phase. Ashbrook, J. 1952, A. J. 57, 259. The intensity and phase angle of the normal . 1958, A. J. 58, 171. Domke, K. and Pohl, E. 1952, A. N. 281, 113. points were computed next. Again it was found Guthnick, P. and Prager, R. 1927, A. N. 229, 455. that the light in the maxima shows a reflection . 1927, Kleinere Veröff. Berlin-Babelsberg No. 4, 16. Hertzsprung, E. 1928, B. A. N. 4, 153. effect (cos 6 term) which has a sign opposite Jordan, F. C. 1929, Pub. Allegheny Obs. 7, 136. from that expected by the theory. Under these Oosterhoff, P. Th. 1929, B. A. N. 5, 37. .1930,5.^.^.5,151. circumstances no effort was made to determine . 1950, 5. Æ A. il, 217. the orbital elements. Satanova, E. A. and Grigorevsky, V. M. 1957, Astr. Cire. U.S.S.R. No. 187, 17. I am much indebted to Dr. R. S. Alexander Struve, O., Horak, H. G., Canavaggia, R., Kourganoff, V. who spent three nights observing V566 Ophiuchi, and Colacevich, A. 1950, Ap. J. m, 658; Contr. Mc- Donald Obs. No. 189. and to Mr. H. G. Haynes, Jr. who observed AB Szafraniec, R. 1955, Acta Astr. Ser. c, 5, 193. Andromedae during three nights. Part of this . 1956, Acta Astr. 6, 141. . 1957, Acta Astr. 7, 188. work was supported by the ONR contract Nonr . 1958, Roczn. Astr. Obs. Krakow No. 29, 106. 2320(00). Woodward, E. J. 1951, Æ J. 56, 77.

ERRATA A. J. 63, No. 1259: Page 164, in appendix table, line Perth:/or incomplete read complete. in note to table, under Zones missing: delete —320 to — 37°. Mr. Spigl from Perth Observatory (Western Australia) kindly called the author’s attention to the omission of the relevant volumes of the Astrographic Catalogue published in Perth as early as 1922. Due to the circumstances at the end of the first world war these volumes never reached the Hamburg Observatory. A. J. 63, No. 1264: Page 431, line 2, for sin 77 read sin 77'. line 11-12, the formula for (rdti/dr)* needs a factor (o/r)5 associated with the factor — 5^4. line 19, for diï/dE = '(dü/dE)*' read diï/dE = \dti/dE')*'. A. J. 63, No. 1264: Page 462, lines 36-44, in Sterne’s remarks: for Thus . . . density, read Thus, he proposed to carry out a broad step-by-step numerical integration in which the satellite travels through an osculating exponential atmosphere adjusted to the density and density gradient at perigee. Each step consists of several hundred revolutions. Because the orbit is changing and the perigee has changed its position, it will be desirable to restart the procedure with new perigeal values.