COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS Number 2189 Konkoly Observatory Budapest 1982 August 16 HU ISSN 0374-0676 PHOTOELECTRIC MINIMA OF ECLIPSING BINARIES The following Table gives photoelectric minima obtained during the years 1980/81 at the Ege University Observatory, Izmir (Turkey) and the Nurnberg Observatory (Germany). Minima of eclipsing binaries observed at both observatories 1960-1979 were published in Astr, Nachr. 288, 69 (1964); 289, 191 (1966); 291, 111 (1968); IBVS 456 (1970), 530 (1971), 647 (1972), 937 (1974), 1053 (1975), 1163 (1976), 1358 (1977), 1449 (1978) and 1924 (1981). The Table gives 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: 48 cm Cassegrain, Nurnberg: 34 cm Cassegrain, both with phototube 1P21). Abbreviations of the observers' names: Bo = G. Bode Pl = E. Pohl Bz = S. Bozkurt Rd = E. Roderer Er = A.Y. Ertan Sn = S. Evren Fr = W. Freudling Sr = C. Sezer Gd = N. Gudur Tg = I. Thiering Gl = O. Gulmen Tj = T. Eker Gr = R. Grobel Tm = O. Tumer Ib = C. Ibanoglu Tn = Z. Tunca Ir = M. Iper Va = V. Keskin Kt = M. Kurutac Wo = G. Wolfschmidt Me = T. Mertelmeier Ze = Th. Zenker Mi = F. Mittl Remarks: O-C (I): GCVS, Moscow 1969/70 or First or Second or Third Supple- ment to the Third Edition of the GCVS. Moscow 1971, 1974 and 1976 Table I Star Min.hel. O-C (I) O-C (II) O-C (III) Filt. Obs. Instr. Rem. 2444 RT And 851.3146 -0.0074 -0.0030 B Ib/Tj 48 .3136 -0.0084 -0.0040 V Ib/Tj 48 WW Aur 256.3632: +0.0024: -0.0013: V Fr/Ze 34 MinII 925.4902: -0.0006: -0.0043: V Wo 34 MinII IM Aur 517.4706 -0.0251= -0.0251 B, V Sr/Sn 48 MinII 567.3674 -0.0202= -0.0202 B, V Gd/Ir 48 SV Cam 291.3915: -0.0101: -0.003: V Pl/Rd TW Cas 886.4548: -0.0069: -0.0111: V Wo 34 DO Cas 294.3536: -0.0070: -0.0025: V Tg/Ze 34 485.3780 -0.0047 +0.0001 B Tm/Sn 48 .3786 -0.0041 +0.0007 V Tm/Sn 48 498.3856 -0.0057 -0.0010 B Tm/Sn 48 .3858 -0.0055 -0.0008 V Tm/Sn 48 830.4458 -0.0091 -0.0038 B Tn/Tm 48 .4456 -0.0093 -0.0040 V Tn/Tm 48 NN Cep 086.4796 -0.0003 B, V Gd/Gl 48 MinII 438.4512 +0.0011 B, V Gl/Va 48 MinII 474.4717 +0.0013 B, V Gl/Va 48 504.3151 -0.0007 B, V Gd/Gl 48 MinII 506.3741 .0000 B, V Gd/Sr 48 MinII 507.4026 -0.0007 B, V Gl/Sn/Va 48 511.5194 -0.0005 B, V Gl/Gd 48 824.3814 -0.0009 B, V Gl/Ir 48 827.467 -0.003 B, V Sn/Ir 48 MinII 859.3742 +0.0007 B, V Gl/Sn 48 RT CrB 438.3595 +0.0974 B Er/Va 48 438.3637 +0.1016 V Er/Va 48 791.4394 +0.0960 B Er/Tj 48 Table I (cont.) Star Min.hel. O-C (I) O-C (II) O-C (III) Filt. Obs. Instr. Rem. 2444 RT CrB 791.4474 +0.1040 V Er/Tj 48 V477 Cyg 853.4621: +0.0085: -0.0048: V Wo 34 V478 Cyg 777.4777 +0.0789 B, V Gd 48 800.5236 +0.0777 B, V Gd/Sn 48 813.5094 +0.0995 B, V Sr/Tm 48 MinII 816.3893 +0.0985 B, V Sr 48 MinII 826.4533 +0.0794 B, V Gl/Tm 48 829.3318 +0.0770 B, V Gl/Sn/Va 48 849.4970 +0.0760 B, V Gd/Sr 48 852.3781 +0.0762 B, V Gl/Sn 48 862.481 +0.096 V Gl/Tm 48 MinII V548 Cyg 456.4955 -0.0064= -0.0064 B Er/Tm/Tj 48 .4958 -0.0061= -0.0061 V Er/Tm/Tj 48 484.4685 -0.0146= -0.0146 B Ib/Er 48 MinII .4657 -0.0174= -0.0174 V Ib/Er 48 MinII V836 Cyg 853.4904 +0.0082 +0.0070 B Bz/Sn 48 .4900 +0.0078 +0.0066 V Bz/Sn 48 WW Dra 446.3408 +0.2110 +0.0875 +0.0010 B Tm/Ir 48 .3404 +0.2106 +0.0871 +0.0006 V Tm/Ir 48 Z Her 066.4891 -0.0034= -0.0034 B Tn/Tm 48 .4887 -0.0038= -0.0038 V Tn/Tm 48 070.4841 -0.0012= -0.0012 B Tm/Sn 48 078.4710 +0.0001= +0.0001 B Kt/Tn 48 .4706 -0.0003= -0.0003 V Kt/Tn 48 092.4453 -0.0004= -0.0004 B Ib 48 MinII 106.4245 +0.0040= +0.0040 B Ib/Kt/Er 48 .4237 +0.0032= +0.0032 V Ib/Kt/Er 48 RX Her 711.5557 +0.0014 +0.0015 V Gr 34 Table I (cont.) Star Min.hel. O-C (I) O-C (II) O-C (III) Filt. Obs. Instr. Rem. 2444 RT Lac 472.5261 -0.0247 -0.0210 B Tm/Tj 48 .5240 -0.0268 -0.0231 V Tm/Tj 48 500.4349 -0.0229 -0.0193 B Sn/Va 48 MinII .4287 -0.0291 -0.0255 V Sn/Va 48 MinII 845.4617 -0.0290 -0.0254 B, V Er/Sn 48 MinII 850.5368 -0.0279 -0.0243 B Er/Sn 48 MinII .5348 -0.0299 -0.0263 V Er/Sn 48 MinII SW Lac 925.284: -0.019: -0.001: V Wo 34 MinII AR Lac 449.4969 -0.0209 -0.0215 -0.0015 B Tm/Tj 48 .4972 -0.0206 -0.0212 -0.0012 V Tm/Tj 48 451.4807 -0.0203 -0.0209 -0.0009 B Er/Va 48 .4803 -0.0207 -0.0213 -0.0013 V Er/Va 48 458.4220 -0.0202 -0.0208 -0.0007 B Ib/Va 48 MinII .4214 -0.0208 -0.0214 -0.0013 V Ib/Va 48 MinII 809.4453 -0.0230 -0.0239 +0.0001 B Tm 48 MinII .4450 -0.0233 -0.0242 .0000 V Tm 48 MinII 817.3822 -0.0189 -0.0198 +0.0043 B Er 48 MinII .3811 -0.0200 -0.0209 +0.0032 V Er 48 MinII 818.3714 -0.0213 -0.0222 +0.0019 B Tm 48 .3690 -0.0237 -0.0246 -0.0005 V Tm 48 UV Leo 292.4549 -0.0035 +0.0103 V Bo/Gr 34 MinII XY Leo 706.4411 -0.053 +0.0437 V Gr 34 MinII AM Leo 715.420: -0.005: -0.017: V Gr 34 MinII ER Ori 252.340: -0.024 +0.007 V Fr/Me 34 MinII FT Ori 590.4619 -0.0009= -0.0009 B, V Gl/Sn 48 DM Per 491.3405 +0.0443 -0.0113 B, V Sr/Sn 48 MinII 499.5237 +0.0443 -0.0113 B, V Sr 48 MinII 506.3519 +0.0532 -0.0025 B, V Sr/Gd 48 Table I (cont.) Star Min.hel. O-C (I) O-C (II) O-C (III) Filt. Obs. Instr. Rem. 2444 DM Per 510.4348 +0.0445 -0.0112 B, V Sr/Sn/Tj 48 MinII 517.2671 +0.0575 +0.0017 B, V Sr/Sn 48 566.3676 +0.0589 +0.0029 B, V Sr 48 855.5057 +0.0578 +0.0003 B, V Sr/Sn 48 885.508 +0.055 -0.003 V Wo 34 LX Per 560.4196 -0.0108 = -0.0108 B Er/Ir 48 MinII .4133 -0.0171 = -0.0171 V Er/Ir 48 MinII IQ Per 290.3461 +0.0062 = +0.0062 V Me/Mi 34 HU Tau 902.6432: +0.0055:= +0.0055: V Wo 34 V471 Tau 186.42381 -0.00172 +0.00023 B Tn/Tm/Sn 48 188.50853 -0.00173 +0.00022 B Tm/Sn 48 281.27920 -0.00170 +0.00039 B Tn/Tm/Sn 48 498.61236 -0.00202 +0.00043 B Tm/Sn 48 518.41743 -0.00192 +0.00056 B Ib 48 589.29850 -0.00179 +0.00082 B Tn/Tm/Ir 48 638.28986 -0.00167 +0.00102 B Ib/Tm 48 W UMa 293.3981 +0.0073 -0.0004 V Mi/Ze 34 925.6405 +0.0076 -0.0021 V Wo 34 AG Vir 709.4356: +0.0050: -0.0060: V Gr 34 AH Vir 343.432 +0.057 -0.005 V Fr/Ze 34 MinII Z Vul 852.5044 -0.0059 +0.0094 V Wo 34 ER Vul 836.4758 +0.0038 +0.0144 B Ib/Sn/Va 48 .4751 +0.0031 +0.0137 V Ib/Sn/Va 48 837.4987 -0.0205 -0.0099 B Tn 48 MinII .5012 -0.0180 -0.0074 V Tn 48 MinII 838.5499 -0.0164 -0.0058 B Sn/Va 48 .5546 -0.0117 -0.0011 V Sn/Va 48 O-C (II): SAC 53, Krakow 1981 O-C (III):NN Cep 2444 507. 4033 + 2.058305d E (N. Gudur, O. Gulmen, IBVS 1881, 1980) WW Dra 2441 918. 4994 + 4.6297444d.E (Z. Tunca C. Ibanoglu, M. Kurutac, S. Evren, O. Tumer, A.Y. Ertan, IBVS 2040, 1981) AR Lac 2441 593. 7115 + 1.98319197d.E - 4.591d*10^-9*E2 (M. Kurutac, C. Ibanoglu, Z. Tunca, A.Y. Ertan, S. Evren, O. Tumer, Astrophys. Space Science 77, 325, 1981) V471 Tau 2440 610. 06478 + 0.52118371d.E - 8.1*10^-11*E^2 (Z. Tunca, O. Tumer, M. Kurutac, C. Ibanoglu, Astrophys. Space Science 64, 421, 1979) The (O-C)'s for secondary minima (Min II) were calculated on the supposition, that they are symmetric between primary minima (if no special data are given). 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 (last decimal) is uncertain. E. POHL S. EVREN, O. TUMER, C. SEZER Nurnberg Observatory Ege University Observatory Regiomontanusweg 1 Bornova/Izmir P.K. 21 85 Nurnberg 20, F.R.G. Turkey