COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS Number 937 Konkoly Observatory Budapest 1974 October 22 PHOTOELECTRIC MINIMA OF ECLIPSING BINARIES The following Table gives photoelectric minima obtained during the years 1972 and 1973 at the Ege University Observatory, Izmir (Turkey) and the Nurnberg Observatory (Germany). Minima of eclipsing binaries observed at both Observatories 1960 - 1971 were published in Astr.Nachr. 288, 69 (1964); 289, 191 (1966); 291, 111 (1968); IBVS 456 (1970), 530 (1971) and 647 (1972). The Table gives besides the heliocentric minima three different O-C's, the type of filter (UBV), the abbreviations of the names of the observers and the type of the instruments used (Izmir: 48cm Cassegrain, Nurnberg: 34cm Cassegrain, both with phototube 1P21). Abbreviations of the observers' names: Ab - A. Alabas Hu - R. Hufnagel An - H. Alkan Ib - C. Ibanoglu Bo - G. Bode Ky - E. Kuyucu By - C. Baygun Me - M. Meier Bz - S. Bozkurt Ms - M. Cirak Eb - J. Ebersberger Od.- O. Demircan Ek - S. Ertukel Pl - E. Pohl Er - A.Y. Ertan Rk - R. Akinci Gd - N. Gudur Rn - R. Pekunlu Gl - O. Gulmen Sb - R. Sendelbeck Go - G. Gorz Sc - H. Schellemann Gp - G. Grampp Sh - T. Scharold Gr - R. Grobel Sr - C. Sezer Hk - W. Huck Tn - Z. Tunca Hn - H. Halicinarli Vo - H. Vogel Ho - D. Holzl We - T. Weber Hs - H. Karacan Wu - J. Wunner Remarks: O-C (I) : GCVS, Moscow 1969/70, FT Ori GCVS (1970), phase of secondary minimum Phi_s=0.746.P (Cristaldi, S. 1970, Astron.Astrophys. 5, 228.) O-C (II) : SAC 44/45, Krakow 1972/73, O-C (III) : new elements : i Boo IBVS 209 (1967) Pohl VZ CVn, T_min= 24 38880.5807+0d.84246150.E (Ibanoglu, unpublished) RZ Cas Scientific Reports of the Faculty of Science, Ege University No. 120, Astronomy No. 12 (1971), A. Kizilirmak AK Her IBVS 369 (1969) Ibanoglu and Kurutac The (O-C)'s for secondary minima (Min II) were calculated on the supposition that they are symmetric between primary minima (if not special data are given). m: only the elements I or the elements II give secondary minimum. The sign = between O-C(I) and O-C(II) indicates, that the elements (I) and (II) are equal. The sign : means that the time of minimum is uncertain. Star Min.hel. O-C (I) O-C (II) O-C (III) Filt. Obs. Instr. Rem. cm 2441 RT And 619.2458 -0.0101 -0.0062 Gl/An 48 924.2795 -0.0080 -0.0075 Gl/Ms 48 BX And 618.3634 +0.0035= +0.0035 B,V Rk/Hs 48 679.371 -0.000 = -0.000 Hk/Sh 34 900.538 0.000 = 0.000 Sc/Sh/Vo " MinII 951.484 : +0.001:= +0.001 : B Od/By/Ek 48 951.486 : +0.003:= +0.003 : V " " CN And 509.4954 -0.0379 B Gd/Hs " MinII 509.4930 -0.0403 V Gd/Hs " MinII 512.5049 -0.0366 B Gd/Rk/Rn " 512.5044 -0.0371 V Gd/Rk/Rn " 567.5761 -0.0383 B Gl/Rk/Rn " 567.5746 -0.0398 V Gl/Rk/Rn " 568.5016 -0.0384 B Gd/Rn " 568.5012 -0.0388 V Gd/Rn " 577.5282 -0.0364 B Gl/Hs " MinII 577.5278 -0.0368 V Gl/Hs " MinII KO Aql 887.4717 +0.0822 -0.0080 B Ib/Tn/S r " 887.4710 +0.0815 -0.0087 V " " KP Aql 499.3406 +0.0397 +0.0016 B Gl/Hs " MinII 499.3420 +0.0411 +0.0030 V Gl/Hs " " 834.4077 +0.0452 +0.0046 B Gl " 834.4070 +0.0445 +0.0039 V Gl " 861.3482 +0.0460 +0.0052 B Ib/Gl " 861.3475 +0.0453 +0.0045 V Ib/Gl " 898.3925 +0.0483 +0.0073 B Ib/Er/Sr " 898.3904 +0.0462 +0.0052 V " " 903.4416 +0.0463 +0.0051 B,V, Ib/Er " MinII OO Aql 571.3468 -0.0242 +0.0065(m) B Od " 571.3476 -0.0234 +0.0073(m) V Od " 626.331 : -0.027:(m)+0.004: B,V Od/Hs " 890.3721 -0.0256(m)+0.0096 B Od/Sr/Ky " 890.3711 -0.0266(m)+0.0086 V " " 922.2987 -0.0270(m)+0.0086 B,V Ib/Tn/Er " 940.2886 -0.0283 +0.0076(m) B,V Ib/Gl/Tn " sigma Aql 911.341: -0.046:= -0.046: B,V An/Sr/Ms " RX Ari 661.475 +0.021 B Rk/An " 661.474 +0.020 V Rk/An " SX Aur 677.3552 +0.0200 +0.0166 Eb/Hk/Hu 34 691.272: +0.021: +0.018: B An/Hs 48 MinII 691.271: +0.020: +0.017: V An/Hs " " 692.4826 +0.0214 +0.0180 B An/Hs " " 692.4812 +0.0200 +0.0166 V An/Hs " " 763.275: +0.024: +0.021: B,V An/Hs " 769.3249 +0.0238 +0.0204 B An/Hs " 769.3235 +0.0224 +0.0190 V An/Hs " 775.371: +0.020: +0.016: B An/Hs " 775.372: +0.019: +0.015: V An/Hs " 957.4884 +0.0203 +0.0169 B Ib/Gl " MinII 957.4889 +0.0208 +0.0174 V " " " WW Aur 399.305 +0.001 -0.003 Ho/Hu 34 AR Aur 941.464 +0.018 = +0.018 Sc/Sh/Vo " Star Min.hel. O-C (I) O-C (II) O-C (III) Filt. Obs. Instr. Rem. cm 2441 BF Aur 684.373 +0.005 +0.017 Eb/Hu/Sh 34 MinII 752.456 +0.010 +0.022 Eb/Vo " TZ Boo 356.5277 +0.0053 B Gd/Gl/Hs 48 MinII 356.5284 +0.0060 V Gd/Gl/Hs " " 392.483: +0.004: B Rk/Rn " " 392.484: +0.005: V Rk/Rn " " 443.4479 +0.0060 B Bz/Ib " 443.4479 +0.0060 V Bz/Ib " 450.427: +0.002: B Bz/Ib " MinII 450.428: +0.003: V Bz/Ib " " 453.398: +0.001: B Bz/Ib " " 453.397: +0.000: V Bz/Ib " " 462.313 +0.001 Rk/Rn " " 465.437: +0.005: B Rk/Hs " 465.436: +0.004: V Rk/Hs " 484.4587 +0.0086 B Ib/Hs " 484.4574 +0.0073 V Ib/Hs " i Boo 384.5323 +0.0148 +0.0169 +0.0125 Gl/Hs " MinII 392.432 +0.014 +0.016 +0.012 Go/Ho 34 435.4166 +0.0144 +0.0168 +0.0121 Gd/Hs 48 MinII 462.464: +0.013: +0.015: +0.010: Rk/Rn " " 585.392: +0.014: +0.017: +0.011: Bo/Hk 34 " 599.314 +0.009 +0.013 +0.007 Ho/Hk " " 758.407: +0.021: +0.025: +0.018: Sh/Vo " " 798.444 +0.019 +0.024 +0.017 Sh/Vo " 819.464: +0.016: +0.020: +0.014: Sc/We " MinII SV Cam 681.2879 -0.0045 -0.0013 Pl/Sh " AS Cam 547.5273 -0.2117 B Bz/Gl 48 MinII 547.5282 -0.2108 V Bz/Gl " " 578.4065 -0.2112 B Gl/Hs " " 578.4065 -0.2112 V Gl/Hs " " 580.3330 -0.0002 E Gd/Od " " 580.3338 +0.0006 V Gd/Od " VZ CVn 327.5098 -0.0019 -0.0003 V Ib/Rk " MinII 357.418: -0.001: 0.000: V Bz/Ib/Rk " RZ Cas 333.3257 -0.0043 -0.0087 +0.0013 Go/Ho 34 511.4206 -0.0013 -0.0063 +0.0024 B Rk/Rn/Ab 48 511.4206 -0.0013 -0.0063 +0.0024 V Rk/Rn/Ab " 560.4240 -0.0030 -0.0082 0.0000 Eb/Hk 34 566.4022 -0.0010 -0.0062 +0.0020 Eb/Ho " 584.3326 +0.0007 -0.0046 +0.0034 B Rk/Hs 48 584.3326 +0.0007 -0.0046 +0.0034 V Rk/Hs " 860.4375 +0.0024 -0.0029 +0.0030 Hk/Sb 34 921.394 +0.002 -0.004 +0.002 Ho/Sb " 933.346 +0.002 -0.005 +0.001 B Ob/By/Ek 48 933.345 +0.001 -0.006 0.000 V " " 934.5418 +0.0024 -0.0042 +0.0017 Eb/Sc 34 TV Cas 595.3586 -0.0062 +0.0010 Hk 34 TW Cas 671.301 -0.014 -0.017 B Od/Hs 48 671.300 -0.015 -0.018 V Od/Hs " DO Cas 936.3666 +0.0024= +0.0024 B,V Gl/Sr " 960.331: +0.003:= +0.003: Sh/Vo 34 MN Cas 656.5043 -0.0053 +0.0170 B Rk/An 48 656.5032 -0.0064 +0.0159 V Rk/An " 682.384 -0.004(m)+0.018 Eb/Hk/Hu 34 Star Min.hel. O-C (I) O-C (II) O-C (III) Filt. Obs. Instr. Rem. cm 2441 PV Cas 666.2908 +0.0652 +0.0043 B Od 48 666.2907 +0.0651 -0.0044 V Od " 855.341: +0.066: -0.005: B,V Ib " 924.4506 +0.0319 -0.0010 B Gl/Ms " MinII 924.4501 +0.0314 -0.0015 V " " U Cep 395.361 +0.023 +0.019 Me/Wu 34 VW Cep 596.364 -0.071 +0.007 Hk " 678.327 -0.072 +0.006 Eb/Hu " MinII 698.419: -0.071: +0.008: Sh/Vo " " 814.426 -0.071 +0.010 Sc/Sh/Vo " " 829.456 -0.070 +0.011 Eb/Sc " " 989.344 -0.076 +0.007 Sc/Sh/Vo " RW Cet 952.4322 -0.0344 -0.0043 B Tn/Er/Ms 48 952.4315 -0.0351 -0.0050 V " " KR Cyg 528.4524 -0.0083 +0.0100 Od/Ab 627.331 -0.013 +0.006 B Od/Hs " 627.333 -0.011 +0.008 V Od/Hs " MR Cyg 674.242 -0.006 -0.002 Eb/Pl 34 839.429: -0.006: -0.002: B Od 48 MinII 839.432: -0.003: +0.001: V Od " 477 Cyg 931.4592 -0.0129 +0.0052 Bo/Ho 34 836 Cyg 492.3348 -0.0017 -0.0034 Rk/Rn/Ab 48 521.408: -0.005: -0.007: V Rk " MinII 525.321: -0.013: -0.014: Rk/Rn " " 854.327: +0.001: -0.001: B,V Gl " 881.446: +0.003: +0.002: B,V Od/By/Ek " MinII TW Dra 503.4655 -0.0248 +0.0018 Gr/Hk 34 764.500: -0.029: +0.001: Gp/Gr " TZ Dra 519.3351 +0.0054 +0.0057 Od/Ab/Hs 48 UZ Dra 570.2834 +0.0014= +0.0014 B Od " 570.2829 +0.0009= +0.0009 V Od " WW Dra 918.503: +0.126:= +0.126: Eb 34 AI Dra 463.4384 +0.0075 +0.0083 Gd/Rn 48 529.3737 +0.0081 +0.0088 Od/Ab " 831.4739 +0.0073 +0.0080 Eb/We 34 849.4561 +0.0072 +0.0080 Sc/Sh/Vo " BS Dra 461.4252 +0.0542= +0.0542 B Gl/Hs 48 461.4252 +0.0542= +0.0542 V Gl/Hs " 471.5166 +0.0536= +0.0536 B Rk/Hs " 471.5163 +0.0533= +0.0533 V RK/Hs " 488.3335 +0.0505= +0.0505 B Rk/Rn " 488.3319 +0.0489= +0.0489 V Rk/Rn " 493.3817 +0.0527= +0.0527 B Gl/Rk " MinII 493.3838 +0.0548= +0.0548 V Gl/Rk " " 826.4196 +0.0546= +0.0546 B,V Ib/Gl " UX Eri 922.5394 -0.0232 +0.0395 Ib/Tn/Sr " MinII YY Eri 680.3167 -0.0066 -0.0006 Eb/Sh/Vo 34 928.5125 -0.0059 +0.0022 B Ib/Tn 48 928.5116 -0.0068 +0.0013 V " " RX Her 524.3530 +0.0004 -0.0002 Gd/Hs " Star Min.hel. O-C (I) O-C (II) O-C (III) Filt. Obs. Instr. Rem. cm 2441 SZ Her 931.389 +0.023 +0.013 B,V Od/By 48 TX Her 455.3767 -0.0086 +0.0011 Rk/Rn " MinII 492.453: -0.009: +0.001: 768.4670 -0.0095 +0.0002 B Ib/An " " 768.4677 -0.0088 +0.0009 V Ib/An " " AK Her 512.445 -0.017= -0.017 +0.002 Gr/Hk 34 786.436 -0.018= -0.018 +0.003 B Ob/Hs 48 786.433 -0.021= -0.021 0.000 V Ob/Hs " 832.3795 -0.0203= -0.0203 +0.0004 B Od " 832.3802 -0.0196= -0.0196 +0.0011 V Od " 853.456 -0.020= -0.020 +0.001 Sc/Sh/Vo 34 338 Her 945.3359 +0.0736 +0.0197 B,V Tn/Er 48 AI Hya 411.368: -0.542: Bz/Ib " SW Lac 598.3161 -0.0354 -0.0380 B Od/An " 598.3154 -0.0361 -0.0387 V Od/An " 683.3055 -0.0390 -0.0416 Ed/Hu 34 AR Lac 513.393: -0.022: -0.023: B Rk/Ab 48 MinII 513.391: -0.024: -0.025: V Rk/Ab " " UV Leo 390.441 -0.007 +0.005 Gp/Me 34 466.3544 -0.0042 +0.0072 Rk/Hs 48 766.3971 -0.0042 +0.0077 Eb/Sh/Vo 34 AM Leo 386.4876 -0.0004 -0.0241 Gd/Hs 48 FL Lyr 959.2641 -0.0014 +0.0049 B,V Gl/Tn/Er " U Oph 494.4387 -0.0059 -0.0026 B Rk/Hs " 494.4392 -0.0054 -0.0021 V Rk/Hs " 451 Oph 527.3779 +0.0120 B Rk/Rn " MinII 527.3772 +0.0113 V Rk/Rn 456 Oph 897.5343 +0.1710 B Od/By/Ek " 897.5340 +0.1707 V " " 951.3835 +0.1729 B " " 951.3830 +0.1724 V " " 502 Oph 491.3772 +0.0036= +0.0036 Hs " MinII 888.320: +0.001:= +0.001: B Od/By/Ek " 888.321: +0.002:= +0.002: V " " 566 Oph 479.4702 +0.0093= +0.0093 B Rk/Hs " 479.4704 +0.0095= +0.0095 V Rk/Hs " 845.489 +0.014= +0.014 Sc/Sh/Vo 34 MinII 851.4283 +0.0134= +0.0134 B,V Ib/An 48 895.468 +0.017= +0.017 Sc/Sh/Vo 34 ER Ori 626.416 -0.016= -0.016 B Od/Hs 48 626.415 -0.017= -0.017 V Od/Hs " 664.3099 -0.0163= -0.0163 B,V Od/An " MinII FT Ori 575.5135 +0.0120 +0.0229 B Gl/Rn " 575.5136 +0.0121 +0.0230 V Gl/Rn " 675.5048 -0.0094 B Ib/Gl " MinII 675.5047 -0.0095 V Ib/Gl " " AT Peg 661.2728 -0.0478 -0.0042 B Rk/An " 661.2729 -0.0477 -0.0041 V Rk/An " Star Min.hel. O-C (I) O-C (II) O-C (III) Filt. Obs. Instr. Rem. cm 2441 AG Per 673.385 -0.009 -0.004 Eb/Gr/Hk 34 DM Per 609.496 +0.044 = +0.044 Bo/Hk " 920.4575 +0.0449= +0.0449 B,V Er/Ms 48 IZ Per 332.440 +0.017 = +0.017 Hk/Me 34 beta Per 647.3510 -0.0428 -0.0041 Eb/Ho " UV Psc 888.4944 +0.0145= +0.0145 B Od/By/Ek 48 888.4939 +0.0140= +0.0140 V " " 525 Sgr 939.339: +0.001:= +0.001: B,V Od/By " RS Sct 922.3702 +0.0188 +0.0031 B,V Ib/Tn/Sr " 958.239 +0.019 +0.003 B,V Od/By/Ek " CD Tau 576.4704 +0.0053 -0.0113 B Gd/Hs " MinII 576.4709 +0.0058 -0.0108 V Gd/Hs " " 619.4068 +0.0025 -0.0139 B Gl/An " 619.4073 +0.0030 -0.0134 V Gl/An " 660.6300 +0.0041 -0.0125 B Ib/Gl " 660.6307 +0.0046 -0.0118 V Ib/Gl " 662.3462 +0.0027 -0.0143 B Rk/An " MinII 662.3458 +0.0023 -0.0147 V Rk/An " " 674.373 +0.007 -0.010 Eb/Me 34 X Tri 320.3701 -0.0071 -0.0212 B Ib/Hs 48 320.3707 -0.0065 -0.0206 V Ib/Hs " 321.3422 -0.0065 -0.0206 B Gl/Hs " 321.3422 -0.0065 -0.0206 V Gl/Hs " 357.289: -0.006: -0.021: B Bz/Ib/Rk " 357.289: -0.006: -0.021: V Bz/Ib/Rk " 572.4850 -0.0050 -0.0204 B Gd/Rn " MinII 572.4836 -0.0064 -0.0218 V Gd/Rn " " 575.3965 -0.0081 -0.0235 B Gl/Rn " " 575.3965 -0.0081 -0.0235 V Gl/Rn " " 593.3692 -0.0088 -0.0243 B Ib/An " 593.3702 -0.0078 -0.0233 V Ib/An " W UMa 401.4263 -0.0690 -0.0029 Eb/Hu 34 708.374 -0.076 -0.002 Eb/Hk/Hu " TX UMa 717.4200 -0.0022 -0.0020 Eb/Sh/Vo " 815.4459 : -0.0001 : +0.0002 : Sc/Sh/Vo " VV UMa 776.267 : +0.020 : -0.015 : B,V Od 48 AG Vir 391.427 +0.031 -0.006 Hu/Me 34 AH Vir 765.4077 : +0.0150 :=+0.0150 : Me/Sh/Vo " 859.3401 +0.0136 = +0.0136 B Gl 48 859.3405 +0.0140 = +0.0140 V Gl " BE Vul 944.3450 +0.0101 0.0000 B,V Od/Ek " DR Vul 509.344: +0.009 : -0.020 : Gd/Hs " Correction for Bulletin Nr. 647 The minima for i Boo ends with J.D. 2441 141.4886: From 2441 047.3915 to .... 125.320 minima of the star VZ CVn are given. A. KIZILIRMAK E. POHL Ege University Observatory Nurnberg Observatory Bornova/Izmir P.K. 21, Turkey Lutzowstr. 10., 85 Nurnberg, F.R.G.