COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS NUMBER 530 Konkoly Observatory Budapest 1971 March 9 PHOTOELECTRIC MINIMA OF ECLIPSING BINARIES The following table gives photoelectric Minima obtained during, the year 1970 at the Ege University Observatory, Izmir/Turkey and the Nurnberg Observatory/Germany. Minima of eclipsing binaries observed at both Observatories 1960-1969 were published in Astron. Nachr, 288, 69 (1964); 289, 191 (1966); 291, 111 (1968) and IBVS 456 (1970). The table gives besides the heliocentric minima three different O-C's (see remarks at the end of table) the abbreviations of the names of the observers and the type of the instrument s used (Izmir: 48 cm Cassegrain, Nurnberg: 34 cm Cassegrain, both with phototube 1 P 21 ). No filters were used, except for stars brighter than 7m0 (Schott GG 11 - GG 495), Abbreviations of the Observers' Names Bz = S. Bozkurt, Izmir Ib - C. Ibanoglu, Izmir Dn = H. Donmez, Izmir Iy - I. Yildiran, Izmir En = C. Endres, Nurnberg Ki - A. Kizilirmak, Izmir Gd = N. Gudur, Izmir Kt - M. Kurutac, Izmir Gl = O. Gulmen, Izmir Me - M. Meier, Nurnberg Go = G. Gorz, Nurnberg Od - O. Demircan, Izmir He = K. Herrmann, Nurnberg Pl - E. Pohl, Nurnberg Hl = H. Sengonca, Izmir Rl - R. Akinci, Izmir Ho = D. Holzl, Nurnberg Ro - B. Both, Nurnberg Hs = H. Karacan, Izmir Wk - R. Woitok, Nurnberg Hu = R. Hufnagl, Nurnberg Yy - Y. Yildiz, Izmir -------------------------------------------------------------------------------- Star Min (hel.) O-C(I) O-C(II) O-C(III) Obs. Instr. 2440 cm Remarks -------------------------------------------------------------------------------- AB And 833.4034 +0.0173d +0.0031 Dn/Gl 48 KP Aql 866.2526 +0.0331= +0.0331 -0.0005 Gl/Ib " OO Aql 811.4152 -0.0185 +0.0017 Dn/Od " 1/ 817.494 -0.021 -0.001 Hl/Ib " 1/ 825.3515 -0.0191 +0.0014 Gd/Hl " 2/ 858.291 -0.021 0.000 Pl 34 2/ RX Ari 859.3944 +0.0186 Dn/Gd/Hl 48 beta Aur 517.485: +0.026: Ki/Od " i Boo 661.4273: +0.0081: +0.0070: +0.0061: En 34 3/ 753.4231 +0.0097 +0.0091 +0.0077 Gl/Hs 48 780.471 +0.008 +0.008 +0.006 Ho/Wk 34 SV Cam 857.5139 -0.0018 +0.0003 Hs/Rk 48 RZ Cas 519.3669 +0.0002 -0.0010 Od 746.4607 -0.0030 -0.0051 Ki/Gl " 758.4125 -0.0036 -0.0058 Hs/Od " 819.3702 -0.0035 -0.0059 Od/Rk " TW Cas 534.356 -0.012 -0.013 Od " 751.461 -0.013 -0.014 En/Ro 34 DO Cas 518.423 +0.002= +0.002 Gd 48 PV Cas 767.3886 +0.0253 -0.0369 -0.0093 Ib " 3/ 817.314 +0.062 0.000 -0.001 Hl/Ib " 824.316 +0.063 0.000 -0.001 Ib/Rk " 4/ 824.317 +0.064 +0.001 0.000 Ib/Rk " 5/ 830.4071 +0.0271 -0.0352 -0.0079 Ib/Yy " 3/ 831.3168 +0.0616 -0.0008 -0.0024 Dn/Ib " 852.321 +0.060 -0.002 -0.004 Me/Pl 34 U Cep 809.4802 +0.0068 +0.0193 Od/Yy 48 854.3560 +0.0079 +0.0207 En/Ho 34 874.3009 +0.0084 +0.0215 Dn/Ib 48 VW Cep 765.311 -0.066 -0.016 -0.002 Od/Yy " 793.4224 -0.0652 -0.0147 +0.0011 Od/Yy " 829.325 -0.066 -0.015 +0.001 Ib/Yy " 870.379 -0.063 -0.013 +0.004 Hs/Rk " 876.360 -0.066 -0.016 +0.001 Ho/Hu/Wk 34 XX Cep 520.426 -0.009 -0.021 Gd 48 ZZ Cep 871.3481 -0.0003= -0.0003 Hu/Me/Pl 34 EG Cep 829.263 +0.008= +0.008 Ib/Yy 48 840.428 +0.009= +0.009 Dn/Gl " 3/ TT Cet 501.421 -0.003 +0.060 Ib " KR Cyg 841.346 -0.005 +0.012 Od/Rk " MR Cyg 847.467 -0.003 +0.001 Gl/Hl " V477 Cyg 781.433: -0.010: +0.003: Me/Ro 34 V548 Cyg 499.4142 -0.0367 +0.0038 Gd 48 TW Dra 877.5390: -0.0193: -0.0004: En/Wk 34 TZ Dra 814.3824 +0.0038 +0.0041 Od/Yy 48 852.492 +0.008 +0.008 Dn/Gl " -------------------------------------------------------------------------------- Star Min (hel.) O-C(I) O-C(II) O-C(III) Obs. Instr. 2440 cm Remarks -------------------------------------------------------------------------------- AI Dra 848.4444 +0.0049 +0.0056 Ho/Me 34 875.415: +0.002: +0.003: Me " 3/ YY Eri 868.5418 -0.0036 +0.0008 Bz/Gl/Iy 48 Z Her 740.4884 -0.0007 +0.0252 Hs/Od " 752.4671 -0.0004 +0.0255 Hs/Od " 772.4314 -0.0001 +0.0259 Od/Y " 816.3533 +0.0010 +0.0270 Od /Yy " 832.3241 +0.0006 +0.0266 Dn/Od " RX Her 784.4671 +0.0007 -0.0001 Ib " 849.3824 -0.0019 -0.0027 Hs/Rk " 3/ TX Her 834.3431 -0.0095 +0.0001 Gl/Yy " UX Her 781.3576 -0.0329 +0.0002 Hs/Kt " AK Her 775.419 -0.007= -0.007 +0.009 Me/Pl 34 3/ 859.296: -0.013:= -0.013: +0.003:Hu/Pl " 3/ SW Lac 836.4479 -0.0140 -0.0162 Hs/Rk 48 3/ 842.382 -0.013 -0.016 Od/Yy " 843.503 -0.015 -0.017 Od/Yy " 3/ 848.4758 -0.0134 -0.0156 Iy/Rk " CM Lac 787.3442 -0.0046= -0.0046 Od/Yy " 3/ 848.328 +0.001= +0.001 Ho/Me 34 3/ 856.3501 -0.0004= -0.0004 Iy/Hs/Rk 48 3/ AM Leo 683.428 -0.018= -0.018 Hs/Ib " TZ Lyr 749.4635: +0.0150: +0.0031: Gl/Ib " 813.4560 +0.0198 +0.0079 Od/Rk " U Oph 845.304 -0.012 -0.004 Me/Pl 34 V451 Oph 812.398 +0.008 0.000 He/Me " V566 Oph 846.3686 +0.0079= +0.0079 Hl/Od 48 3/ 853.328 +0.003= +0.003 Me/Pl 34 3/ U Peg 511.338 -0.003= -0.003 Gd 48 835.3337 -0.0067= -0.0067 Ib/Rk " 3/ 867.3784 -0.0059= -0.0059 Dn/Rk " AT Peg 877.3368: -0.0479: -0.0044: En/Hu/Wk 34 877.3372 -0.0475 -0.0040 Hl/Rk 48 DI Peg 837.3269 -0.0061 -0.0024 Od/Rk " 859.393 -0.006 -0.003 En/Go 34 IZ Per 871.476 +0.011= +0.011 Me " beta Per 844.5051 -0.0195 +0.0080 Od/Yy 48 UV Psc 860.4014 +0.0104= +0.0104 Gd/Hl " V505 Sgr 818.3492 -0.0284 -0.0020 Gd/Hl " RS Sct 826.376 +0.017 +0.022 Od/Rk " W UMa 718.4707 -0.0499 -0.0007 Gl/Ib " W UMi 820.368 -0.003= -00003 Gd/Rk " DR Vul 774.487 +0.032 +0.026 Pl 34 3/ 827.3553 +0.0049 -0.0012 Ib/Iy 48 871.2803 +0.0387 +0.0326 Hs/Rk " ------------------------------------------------------------------ Remarks: 1/ MinII (O-C I), 2/ MinII (O-C II), 3/ MinII, 4/ B filter, 5/ V filter. Remarks concerning O-C O-C (I) : GCVS, Moscow 1969, O-C (II): SAC 42, Krakow 1971, O-C (III) : new elements, published in IBVS by Ibanoglu, Gulmen, Kurutac, and Pohl : KP Aql IBVS 502(1970) Ibanoglu and Gulmen i Boo IBVS 209(1967) Pohl PV Cas IBVS 386(1969) Pohl VW Cep IBVS 369(1969) Ibanoglu and Kurutac AK Her IBVS 369(1969) Ibanoglu and Kurutac The (O-C)'s for secondary minima were calculated on the supposition that they are symmetric between primary minima (if not special data are given). The sign = between O-C (I) and O-C (II) indicates, that the element (I) and (II) are equal. The sign: means that the time of minimum is uncertain. A. KIZILIRMAK E. POHL Ege University Observatory Nurnberg Observatory P.K. 21 Lutzowstr. 10 Bornova/Izmir 85 Nurnberg Turkey Germany