COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS Number 3355 Konkoly Observatory Budapest 14 July 1989 HU ISSN 0374-0676 PHOTOELECTRIC MINIMA OF ECLIPSING BINARIES The following table gives photoelectric minima obtained during the years 1987/88 at the Ege University Observatory, Izmir (Turkey) and the Nurnberg Observatory (Germany). Minima of eclipsing binaries observed et both observatories 1960-1986 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), 2385 (1983), 2793 (1985) and 3078 (1987). 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: Bk = B. Kilinc Sk = S. Skaberna Ca = M. C. Akan Sn = S. Evren Fr = P. Friedrich Sr = C. Sezer Gd = N. Gudur St = S. Strecker Gl = O. Gulmen Tn = Z. Tunca Gr = R. Grobel Va = V. Keskin Hb = H. Baysal Wk = M. Wieck Ib = C. Ibanoglu Wu = E. Wunder Ls = G. Lichtschlag Zk = Z. Eker Remarks: O-C (I): GCVS, Moscow 1985-1987. O-C (II): SAC 60, Krakow 1988. O-C (III): BX And: 2446359.5597+0.61011255d*E (Z. Eker, N. Gudur, O. Gulmen, V. Keskin, B. Kilinc, C. Sezer, IBVS 3266, 1988) V367 Cyg: 2434266.337+18.59773d*E (C. Akan, Astrophys. Space Sci., 135, 157, 1987) Table Star Min. hel. O-C(I) O-C(II) O-C(III) Filt. Observer Instr. Rem. 244 d d d RT And 7015.4610 -0.0007 -0.0031 V Wu 34 BX And 7040.4438 -0.0111 =-0.0111 -0.0015 B, V Ca/Gd 48 7043.4947 -0.0108 =-0.0108 -0.0012 B, V Sr/Zk 48 7062.4079 -0.0111 =-0.0111 -0.0015 B, V Sr/Zk 48 7063.3246 -0.0096 =-0.0096 +0.0001 B, V Gl/Zk 48 Min II 7439.460: -0.010: =-0.010: +0.001: B, V Bk/Gd/Gl 48 7440.3766 -0.0089 =-0.0089 +0.0025 B, V Sr/Zk 48 Min II 7455.3223 -0.0110 =-0.0110 +0.0005 B, V Va/Zk 48 OO Aql 6976.4984 -0.0007 =-0.0007 V Wu 34 Min II 7263.5923 -0.0025 =-0.0025 V Wu 34 7326.4345 -0.0020 =-0.0020 V Wk/Wu 34 SS Ari 7206.253: -0.071: -0.004: V Ls/Sk/Wu 34 7511.3531 -0.0752 -0.0018 V Fr/St/Wu 34 Min II TZ Boo 6909.391 -0.057 =-0.057 V Ls/Gr 34 7206.5461 -0.0636 =-0.0636 V Gr/Ls/Wu 34 44i Boo 6869.415 +0.014 -0.004 V Ls/Wu 34 Min II 6924.456 +0.019 0.000 V Gr 34 TW Cas 7467.4358: -0.0058:=-0.0058: V Wu 34 V367 Cyg 7359.056 -0.182 -0.003 -0.083 B, V Ib/Sn/Tn 48 V1073 Cyg 7326.4385 -0.0301 -0.0041 =-0.0041 B, V Sr/Zk 48 7348.4413 -0.0314 -0.0052 =-0.0052 B, V Bk/Gd 48 7350.4067 -0.0306 -0.0045 =-0.0045 B, V Hb/Sr 48 Min II 7357.482: -0.028: -0.002: -0.002: B, V Bk/Sr 48 Min II 7377.5175 -0.0320 -0.0057 =-0.0057 B, V Sr/Zk 48 V1425 Cyg 6692.3144 +0.0043 =+0.0043 -0.0009 B, V Gl/Zk 48 Min II 6988.507 +0.007 =+0.007 V Ls/Sk 34 7035.4706 +0.0065 =+0.0065 +0.0011 B, V Gl/Zk 48 Min II 7047.3698 +0.0080 =+0.0080 +0.0026 B, V Gd/Zk 48 TZ Dra 7071.482 -0.004 -0.002 V Ls/Sk/Wu 34 CV Dra 7276.405: -0.004: V Wk/Wu 34 AK Her 7294.4624 -0.0013 -0.0129 V Ls 34 V450 Her 7239.5911 -0.2438 +0.0236 V Gr 34 RT Lac 7004.3813 -0.0423 -0.0659 -0.0376 B Sn/Va 48 7004.4026 -0.0210 -0.0446 -0.0163 V Sn/Va 48 7065.2953 -0.0157 -0.0399 -0.0107 B Ib 48 7065.2911 -0.0199 -0.0441 -0.0149 V Ib 48 7354.4996 -0.0266 -0.0537 -0.0201 B Ca/Sn 48 7354.4980 -0.0282 -0.0553 -0.0217 V Ca/Sn 48 7387.4686 -0.0382 -0.0737 -0.0316 B Ca/Sn 48 Min II 7387.4755 -0.0313 -0.0668 -0.0247 V Ca/Sn 48 Min II 7425.5274 -0.0340 -0.0619 -0.0272 B Ca/Tn 48 7425.5279 -0.0335 -0.0614 -0.0267 V Ca/Tn 48 XY Leo 7275.4007 +0.0114 =+0.0114 V Ls/Sk 34 XZ Leo 6910.4568 +0.0026 +0.0069 V Ls/Sk/Wu 34 AM Leo 6899.426: +0.007: =+0.007: V Ls/Wu 34 FL Lyr 6925.4551 -0.0024 +0.0057 V Ls/Wu 34 U Peg 7070.3528 -0.0329 -0.0302 V Ls/Sk/Wu 34 RW Per 7207.426: +0.013: -0.017: V Gr/Ls/Wu 34 beta Per 7069.445 +0.014 +0.012 V Wu 34 UV Psc 7094.3872 -0.0047 =-0.0047 -0.0021 B Ca/Sn 48 7094.3877 -0.0042 =-0.0042 -0.0016 V Ca/Sn 48 7410.3932 -0.0034 =-0.0034 -0.0006 B Ca/Sn 48 7410.3956 -0.0010 =-0.0010 +0.0018 V Ca/Sn 48 7434.5021 -0.0039 =-0.0039 -0.0010 B, V Ca/Va 48 V471 Tau 7064.39720 +0.00068 +0.00066 B Ca/Sn 48 7065.43965 +0.00077 +0.00075 B Ib 48 7066.48180 +0.00055 +0.00053 B Tn 48 7448.50870 +0.00031 +0.00029 B Ca/Ib 48 V781 Tau 7206.436: -0.004: V Gr/Sk 34 W UMa 6828.3678 -0.0061 = 0.0061 V Ls/Wu 34 AG Vir 7262.3659 +0.0033 +0.0186 V Wu 34 Min II BD +13d4708 7385.3933 +0.0020 B Ca/Va 48 7385.3975 +0.0062 V Ca/Va 48 V1073 Cyg: 2444502.8652+0.7858551d*E (Z. Aslan, T. J. Herczeg, IBVS 2478, 1984) V1425 Cyg: 2440400.9457+1.2523877d*E (Z. Eker, N. Gudur, O. Gulmen, V. Keskin, C. Sezer, Astrophys. Space Sci., 146, 283, 1988) CV Dra: 2447305.437+0.617617d*E (F. Agerer, O. Lichtenknecker, IBVS 3213, 1988) RT Lac: 2444873.3648+5.0739496d*E-2.7d*10^-8*E^2 (A. Y. Ertan, S. Evren, C. Ibanoglu, O. Tumer, Z. Tunca, Astrophys. Space Sci., 93, 431, 1983) UV Psc: 2444932.2985+0.86104771d*E (C. Ibanoglu, Astrophys. Space Sci., 139, 139, 1987) V471 Tau: 2440610.06614+0.52118301d*E (S. Evren, C. Ibanoglu, IBVS 2573, 1984) BD +13d4708: 2446730.18247+0.7272018d*E (R. L. Walker, IBVS 3160, 1988) The (O-C)'s for secondary minima (Min II) were calculated on the supposition, that they are symmetric between primary minima (if no special date 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. V. KESKIN E. POHL Ege University Observatory Nurnberg Observatory Bornova/Izmir Regiomontanusweg 1 Turkey 8500 Nurnberg 20, F.R.G.