COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS Number 2793 Konkoly Observatory Budapest 17 September 1985 HU ISSN 0374 - 0676 PHOTOELECTRIC MINIMA OF ECLIPSING BINARIES The following table gives photoelectric minima obtained during the years 1983/84 at the Ege University Observatory, Izmir (Turkey) and the Nurnberg Observatory (Germany). Minima of eclipsing binaries observed at both observatories 1960-1982 were published in Astr. Nachr. 288, 69(1964); 289, 191 (1966); 291, 111(1968); I.B.V.S. No. 456 (1970), 530 (1971), 647 (1972) 937 (1974), 1053 (1975), 1163 (1976), 1358 (1977), 1449 (1978), 1924 (1981), 2189 (1982), and 2385 (1983). 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 observer's names: Be = F. Betten Ka = H. Karl Bu = A. Buchler Ls = C. Lichtschlag Ca = M. Can Akan Ma = D. Matschat Er = A.Y. Ertan Sn = S. Evren Gd = N. Gudur Sr = C. Sezer Gl = O. Gulmen Tm = O. Tumer Gr = R. Grobel Tn = Z. Tunca Ib = C. Ibanoglu Remarks O-C (I): GCVS, Moscow 1969/70 or First or Second or Third Supplement to the Third Edition of the GCVS. Moscow 1971, 1974 and 1976. O-C (II): SAC 56, Krakow 1984. O-C (III): AO Cam 2445745.6396 + 0.329921.d E (E. Evans, D.H. Grossoehme, E.J. Mayer. Jr., IBVS 2497, 1984) DM Del 2445 523.4368 + 0.8446747.d E (C. Sezer, N. Gudur, O. Gulmen, IBVS 2591, 1984) RT Lac 2444 873.3648 + 5.0739496.d E - 2.7.d 10^-8, E^2 (Z. Tunca, C. Ibanoglu, O. Tumer, A.Y. Ertan, S. Evren, Astrophys. Space Science 93,431, 1983) Table Star Min.hel.244 O-C (I) O-C (II) O-C (III) Filt. Obs. Instr. Rem. RT And 5673.3256 -0.0194 -0.0029 V Gr 34 AB And 6002.4573 +0.0028 +0.0006 V Be/Ka 34 Min II BX And 5576.484: +0.001:= +0.001: V Gr 34 Min II " " 5638.411 +0.001= +0.001 V Gr/Ls 34 CN And 5546.4531: -0.0129: V Gr 34 Min II " " 5994.438: -0.014: V Ls 34 Min II SS Ari 5651.3318: -0.0926: -0.0061: V Gr/Ls 34 TZ Boo 5814.3651 -0.0136 V Gr 34 i Boo 5468.4684 +0.0098= +0.0098 B Sn 48 Min II " " 5468.4649 +0.0063= +0.0063 V Sn 48 Min II 5482.5245 +0.0055= +0.0055 B Sn 48 " " 5482.5259 +0.0069= +0.0069 V Sn 48 " " 5870.4565 +0.0061= +0.0061 V Gr/Ls 34 Min II AO Cam 6006.4281 -0.0141 V Be/Gr 34 Min II " " 6022.429: -0.014: V Be/Ka 34 " " 6036.2858 -0.0142 V Gr/Ls 34 " " 6036.4498 -0.0152 V Gr/Ls 34 Min II " " 6036.6157 -0.0142 V Gr/Ls 34 DO Cas 5629.4529: -0.0084: -0.0020: V Gr/Ls 34 PV Cas 5685.3637 -0.0059(m) -0.0008 V Gr/Ls 34 V375 Cas 5561.4814 -0.0247 +0.0136 V Gr 34 V381 Cas 5562.413 -0.079 V Gr/Ma 34 RW CrB 5818.4497 0.0000= 0.0000 V Gr/Ls 34 BR Cyg 5526.4951 -0.0022= -0.0022 V Gr 34 GO Cyg 5866.4836 +0.0246 +0.0334 B, V Gd 48 Min II " " 5954.4082 +0.0231 +0.0321 B, V Gd 48 " " 5972.3528 +0.0236 +0.0326 B Gd 48 " " 5972.3535 +0.0243 +0.0333 V Gd 48 DM Del 5200.345 +0.042 -0.014 -0.004 B, V Gd 48 Min II " " 5523.4355 +0.0452 -0.0105 -0.0013 B, V Gd 48 " " 5605.3694 +0.0459 -0.0099 -0.0008 B, V Gd/Sr 48 " " 5613.396 +0.048 -0.008 +0.001 B, V Sr 48 Min II " " 5619.3059 +0.0453 -0.0105 -0.0015 B, V Gl 48 Min II TZ Dra 5888.4779 -0.0024= -0.0024 V Gr 34 UZ Dra 5878.4650 +0.0025 +0.0032 B Sr 48 UZ Dra 5878.4643 +0.0018 +d.0025 V Sr 48 Table (cont.) Star Min.hel. 244 O-C (I) O-C (II) O-C (III) Filt. Obs. Instr.Rem. UZ Dra 5914.3391 +0.0023 +0.0030 B, V Sr 48 " " 5958.3660 +0.0016 +0.0002 A, V Sr 48 Min II " " 5971.4105 +0.0009 -0.0005 B, V Sr 48 Min II HS Her 5864.529: -0.013:= -0.013: V Gr/Ls 34 MM Her 5543.4730 -0.0799 +0.0119 B, V Sn 48 " " 5547.4657 -0.0674 0.0245 R, V Sn 48 Min II " " 5551.4350 -0.0783 +0.0136 B, V Sn 48 " " 5559.3911 -0.0826 +0.0094 B Sn/Tm 48 " " 5559.3928 -0.0809 +0.0111 V Sn/Tm 48 RT Lac 5629.3843 -0.0412 -0.0086 +0.0016 B Sn/Ca 48 " " 5629.3850 -0.0405 -0.0079 +0.0023 V Sn/Ca 48 " 5903.3674 -0.0548 -0.0216 -0.0081 B Sn/Ca 48 " " 5903.3688 -0.0534 -0.0202 -0.0067 V Sn/Ca 48 " " 5908.4422 -0.0540 -0.0208 -0.0072 B Ib 48 " " 5908.4438 -0.0524 -0.0192 -0.0056 V Ib 48 " " 5969.3265 -0.0578 -0.0245 -0.0101 B Tm 48 " " 5969.3286 -0.0557 -0.0224 -0.0080 V Tm 48 SW Lac 5336.2831 -0.0217 +0.0011 B Gr 34 " " 5336.2841 -0.0207 +0.0021 V Gr 34 " " 5556.4575 -0.0214 +0.0022 V Gr 34 Min II " " 5672.2365 -0.0222 +0.0017 V Bu/Ls 34 Min II " " 6004.3467: -0.0173: +0.0078: V Gr/Ls 34 XY Leo 5810.450 (-0.095) +0.006 V Bu/Gr 34 Min II AM Leo 5808.4204 -0.0071 -0.0210 V Gr/Ls 34 AT Peg 5615.2538 +4.0184 +0.0117 B Gl 48 " " 5957.360 +0.019 +0.021 B, V Gl 48 Min II AG Per 5626.4097 -0.0007 +0.0926 B, V Gd 48 Min II LX Per 5609.3820 -0.0344= -0.0344 B In/Tm 48 " " 5609.3806 -0.0358= -0.0358 V Ib/Tm 48 " " 5629.4788 -0.0331= -0.0331 R, V Sn/Ca 48 Min II V471 Tau 4876.47018 -0.00217 -0.00008 B Tm/Tn 48 " " 4911.38954 -0.00210 +0.00002 B Er/Tm 48 " " 5612.38065 -0.00266 -0.00002 B Ib/Tm 48 " " 5614.46546 -0.00258 +0.00006 B Tm 48 " " 5695.24889 -0.00258 +0.00012 B Ib/Tn 48 Table (cont.) Star Min.hel. 244 O-C (I) O-C (II) O-C (III) Filt. Obs. Instr. Rem. ER Vul 5220.4101 -0.0147 -0.0036 B Er/Tm 48 " " 5220.4073 -0.0175 -0.0064 V Er/Tm 48 " 5221.4559 -0.0161 -0.0049 B, V Er 48 Min II " " 5900.3536 -0.0167 -0.0046 B Sn/Ca 48 " " 5900.3522 -0.0181 -0.0060 V Sn/Ca 48 " " 5901.4043 -0.0132 -0.0010 B Ib/Sn/Ca 48 Min II " 5901.4036 -0.0139 -0.0017 V Ib/Sn/Ca 48 Min II " " 5902.4481 -0.0165 -0.0044 B Sn/Ca 48 " " 5902.4468 -0.0178 -0.0057 V Sn/Ca 48 " " 5933.5126 -0.0173 -0.0051 B Sn/Ca 48 Min II " " 5933.5119 -0.0180 -0.0058 V Sn/Ca 48 Min II " " 5939.4465 -0.0172 -0.0050 B Sn/Ca 48 " " 5939.4472 -0.0165 -0.0043 V Sn/Ca 48 HD199497 5136.4045 +0.0009 B, V Gd/Rn 48 Min II " " 5145.4995 0.0000 B, V Gd 48 Min II " " 5146.4058 -0.0033 B, V Sr/Rn 48 " " 5149.5053 +0.0036 B,V Sr 48 Min II " 5150.4082 -0.0031 B, V Gd/Rn 48 " " 5177.3357 +0.0005 B, V Gd 48 " " 5177.5184 +0.0013 B, V Gd 48 Min II V 471 Tau 2440 610.06614 + 0.52118301.d E (S. Evren, C. Ibanoglu, IBVS 2573,1984) HD 199497 2445 146.4091 + 0.3638368.d E (C. Sezer, O. Gulmen, N. Gudur, IBVS 2553,1984) 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). m = only GCVS gives 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 (last decimal) is uncertain. E. POHL Z. TUNCA, O. GULMEN, S. EVREN Nurnberg Observatory Ege University Observatory Regionmontanusweg 1 Bornova/Izmir P.K. 21, 85 Nurnberg 20, F.R.G. Turkey