COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS Number 3615 Konkoly Observatory Budapest 5 June 1991 HU ISSN 0374 - 0676 PHOTOELECTRIC MINIMA OF ECLIPSING BINARIES The following table gives the photoelectric minima of several eclipsing binaries obtained in the year 1990 at the N. Copernicus Observatory and Planetarium in Brno (Czechoslovakia) by means of the 40-cm telescope, type Nasmyth. The times of minima in U or B band have been omitted in case the signal-to-noise ratio was insufficient. The table gives the type of filter, the heliocentric times of minima, the O-C residuals in the various bands, and abbreviations of the observer's name. These abbreviations are as follows: DH : Dalibor Hanzl TH : Tomás Hudecek MZ : Miloslav Zejda Data for calculating the O-C are taken from the following literature: O-C (I): SAC 62, Krakow 1990. O-C (II) : GCVS, Moscow 1985-1987. O-C (III) : IBVS No. 3596 (our light elements). The moments of the secondary minima are labeled by "s". As far as the data for calculating the times of the secondary minima were not found in the literature, we use the phase 0.5 for predicting the secondary minima Table I Star Filt. Min.hel. O-C (I) O-C (II) O-C (III) Observer 24... [d] [d] [d] KP Aql V 48084.4392 -0.0079 = -0.0079 DH/TH B 48084.4399 -0.0072 = -0.0072 DH/TH OO Aql V 48109.4264 +0.0017 = +0.0017 DH/TH V346 Aql V 48097.4182 -0.0029 -0.0032 DH B 48097.4182 -0.0029 -0.0032 DH V445 Cas V 48151.4726 +0.0344 = +0.0344 DH B 48151.4720 +0.0338 = +0.0338 DH U 48151.4720 +0.0338 = +0.0338 DH EI Cep Vs 48133.4171 -0.0182 +0.0239 TH/DH Bs 48133.4171 -0.0182 +0.0239 TH/DH GS Cep V 48060.4838 -0.1314 = -0.1314 +0.0054 DH B 48060.4845 -0.1307 = -0.1307 +0.0061 DH V 48085.4936 +0.1743 = +0.1743 -0.0024 DH B 48085.4936 +0.1743 = +0.1743 -0.0024 DH V 48088.4365 +0.0292 = +0.0292 -0.0027 DH B 48088.4358 +0.0285 = +0.0285 -0.0034 DH V s 48102.4285 +0.1172 = +0.1172 +0.0008 DH/TH H s 48102.4198 +0.1165 = +0.1165 +0.0001 DH/TH V s 48205.4300 +0.0644 = +0.0644 -0.0034 DH B s 48205.4293 +0.0637 = +0.0637 -0.0041 DH WZ Cyg V 48073.4709 +0.0087 +0.0342 DH B 48073.4709 +0.0087 +0.0342 DH V796 Cyg V s 48134.3799 -0.0237 = -0.0237 DH B s 48134.3792 -0.0244 = -0.0244 DH V1034 Cyg V 48062.4680 +0.0148 +0.0059 DH B 48062.4673 +0.0141 +0.0052 DH U 48062.4666 +0.0134 +0.0045 DH V 48104.4745 +0.0134 +0.0044 MZ/DH V 48106.4245 +0.0095 +0.0005 MZ/DH B 48106.4252 +0.0102 +0.0012 MZ/DH V 48107.4051 +0.0131 +0.0042 DH/TH B 48107.4058 +0.0138 +0.0049 DH/TH V1356 Cyg V s 48095.5099 - +0.0587 DH/TH AK Her V 48100.4112 -0.0026 = -0.0026 TH UV Leo V 47945.4790 +0.0098 -0.0098 TH V501 Oph V 48093.4750 -0.0075 = -0.0075 DH B 48093.4743 -0.0082 = -0.0082 DH V839 Oph V s 48067.4452 +0.0267 +0.0630 DH B s 48067.4452 +0.0267 +0.0630 DH U s 48067.4459 +0.0274 +0.0637 DH V 48120.4113 +0.0279 +0.0642 DH B 48120.4113 +0.0279 +0.0642 DH U 48129.4120 +0.0286 +0.0649 DH GP Peg V 48115.4362 -0.0038 -0.0224 DH SV Tau V 47947.3980 -0.0058 = -0.0058 DH/TH B 47947.3987 -0.0051 = -0.0051 DH/TH GR Tau V 47945.2937 -0.0170 -0.0063 DH B 47945.2943 -0.0164 -0.0056 DH XY UMa V 47944.3526 +0.0004 +0.0073 DH B 47944.3526 +0.0004 +0.0073 DH ZZ UMa V 47967.4137 -0.0031 = -0.0031 DH B 47967.4130 -0.0037 = -0.0037 DH (the secondary minimum is supposed to be symmetric between the primary ones). DALIBOR HANZL Nicholas Copernicus Observatory and Planetarium Kravi hora 616 00 Brno Czechoslovakia