COMMISSION 27 OF THE I.A.U. INFORMATION BULLETIN ON VARIABLE STARS Number 1053 Konkoly Observatory Budapest 1975 October 20 PHOTOELECTRIC MINIMA OF ECLIPSING BINARIES The following Table gives photoelectric minima obtained during the year 1974 at the Ege University Observatory, Izmir (Turkey) and the Nurnberg Observatory (Germany). Minima of eclipsing binaries observed at both observatories 1960-1973 were published in Astr.Nachr. 288, 69 (1964) ; 289, 191 (1966) ; 291, 111 (1968) ; IBVS 456 (1970), 530 (1971), 647 (1972) and (1974). The Table gives besides 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). Remarks: O-C (I) : GCVS, Moscow 1969/70 or Second Supplement to the Third Edition of the GCVS, Moscow 1971 and 1974. O-C (II) : SAC 46, Krakow 1974 O-C (III): i Boo IBVS 209 (1967) Pohl RZ Cas Scientific Reports of the Faculty of Science, Ege University No. 120, Astronomy No. 12 (1971), A. Kizilirmak The (O-C)'s for secondary minima (Min II) were calculated on the supposition that they are symmetric between primary minima (if not special data are given). m: only the elements I or the elements II give 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 is uncertain. E. POHL A. KIZILIRMAK Nurnberg Observatory Ege University Observatory Lutzowstr. 10, 85 Nurnberg, Bornova/Izmir P.K. 21, F.R.G. Turkey --------------------------------------------------------------------------------------------- Star Min.hel. O-C (I) O-C (II) O-C (III) Filt. Obs. Instr. Rem 2442 cm --------------------------------------------------------------------------------------------- RY Aqr 303.3012 -0.0159 -0.0255 B Gl/An/Sr 48 303.3015 -0.0156 -0.0252 V Gl/An/Sr " KO Aql 245.4798 +0.0960 -0.0037 B,V Gd/Ek " OO Aql 247.4023 -0.0004 +0.0084(m) B,V Gd " 252.4697 -0.0009 +0.0080(m) B Gd/Ek " 252.4704 -0.0002 +0.0087(m) V Gd/Ek " 805 Aql 324.2660 -0.0201= +0.0201 B Er/Hn " 324.2663 +0.0204= +0.0204 V Er/Hn " SX Aur 132.3431 +0.0189 +0.0154 B,V Ib/An/Hn 48 403.4045 +0.0230 +0.0195 Ar/Be/Gr 34 XY Boo 183.400: -0.028: B,V Od/Hn " i Boo 095.454: +0.024: +0.029: +0.021: V Sc/Sh/Vo 34 122.371: +0.025: +0.031: +0.023: V Gr/Sc " MinII 187.440: +0.015: +0.021: +0.013: V Eb/Gr " MinII 219.447 +0.019 +0.025 +0.016 B,V Gl 48 268.323 +00019 +0.025 +0.016 B Gl/Hn " MinII 268.324 +0.020 +0.026 +0.017 V Gl/Hn " MinII SV Cam 366.281: -0.009 -0.005 B,V Gl/Tn/Sr " RZ Cas 289.5308 +0.0030 -0.0049 +0.0031 Sc/We 34 300.2881 +0.0031 -0.0049 +0.0033 B Ib/Hn/Er 48 300.2884 +0.0034 -0.0046 +0.0036 V Ib/Hn/Er " 325.3889 +0.0037 -0.0044 +0.0042 B,V Er/By " TV Cas 289.582: -0.013 -0.005 B,V Er/Hn/Sr " TW Cas 265.4822 +0.0026 -0.0207 B Ib/Gl/Sr " 265.4836 +0.0040 -0.0193 V Ib/Gl/Sr " DO Cas 405.3628 +0.0024= +0.0024 Ar/Eb/We 34 VW Cep 146.461: +0.016:= +0.016: Gp/Sb " MinII 261.3962 +0.0078= +0.0078 V Tn/Er/Hn 48 MinII 261.5351 +0.0075= +0.0075 V Tn/Er/Hn " 263.4812 +0.0054= +0.0054 Eb/We 34 364.376: +0.011:= +0.011: V Ki/Sr 48 MinII 385.386 +0.009= +0.009 V Ki/Er/Ek " KR Cyg 221.4741 -0.0127 +0.0073 Eb 34 MY Cyg 276.5320 +0.0107= +0.0107 Eb/We " 548 Cyg 279.3841 +0.0065 -0.0126 B,V Ib/Er/Hn 48 1034 Cyg 223.350: +0.030: -0.002: B Ib/Hn " 223.348: +0.028: -0.004: V Ib/Hn " TW Dra 258.5032: -0.0351: +0.0009 : Eb/Sb/We 34 AI Dra 283.4262 +0.0002 +0.0076 B Er/Hn 48 283.4267 +0.0007 +0.0081 Eb/We 34 283.4269 +0.0009 +0.0083 V Er/Hn 48 BS Dra 302.4277 -0.0567 -0.0567 B Er/Ek " 302.4280 -0.0570 -0.0570 V Er/Ek " 371.3907 -0.0567(m) -0.0567 Eb/Sc 34 TT Her 190.364: -0.014:= -0.014: B Od/Hn 48 190.362: -0.016:= -0.016: V Od/Hn " TX Her 279.303: -0.006: +0.003: B,V Ib/Er/Hn " MinII 280.3332 -0.0060 +0.0036 B,V Gd " AK Her 186.4592 +0.0007 -0.0216 Eb/Gp 34 240.4135 0.0000 -0.0225 B Gd 48 240.4142 +0.0007 -0.0218 V Gd " UV Leo 147.4502: -0.0054: +0.0072: Eb/Hu 34 FL Lyr 194.5042 -0.0019 +0.0047 Eb/Gr " U Oph 217.3754 -0.0048 -0.0021 B,V Ki/Gd 48 451 Oph 286.3136 -0.0022 -0.0019 B,V Ib/An " 456 Oph 239.410 +0.167 B,V Od/By/Ek " MinII 566 Oph 193.4828 +0.0176= +0.0176 Bo/Mi 34 251.4448: +0.0154:= 0.0154: Be/Sb " MinII, 268.4480 +0.0185= +0.0185 B Gl 48 268.4474 +0.0179= +0.0179 V Gl " FT Ori 095.334: +0.016: +0.027: Pf/Sc 34 DI Peg 289.429 -0.002 -0.010 B Od/Er/Sr 48 289.428 -0.003 -0.011 V Od/Er/Sr " AG Per 096.386 -0.012 +0.007 Bb/We 34 MinII IZ Per 324.4202 +0.0163= +0.0163 B,V Er/Hn 48 U Sge 275.4572 -0.0045 -0.0045 Be/Sc/We 34 CC Ser 251.400: +0.001: +0.001: B Od/Hn 48 251.401: +0.002: +0.002: V Od/Hn " 471 Tau 006.3140 -0.0007 B Ib 387.301: +0.001: B Tb W UMa 089.3858 -0.0889 -0.0058 Pf/We 34 TX UMa 201.4143: -0.0003: -0.0001: Ar/Cr/Sc " Z Vul 267.4608 +0.0106= +0.0106 Eb/We " DR Vul 281.380 +0.010 Eb/We " --------------------------------------------------------------------------------------------------- Abbreviations of the observers' names: An = H. Alkan Gl = O. Gulmen Pf = T. Pfeiffer Ar = G. Arneth Gp = G. Grampp Sb = R. Sendelbeck Be = G. Besold Gr = R. Grobel Sc = H. Schellemann Bo = G. Bode Hn = H. Halicinarli Sh = T. Scharold By = C. Baygun Hu = R. Hufnagel Sr = C. Sezer Eb = J. Ebersberger Ib = C. Ibanoglu Tn = Z. Tunca Ek = S. Ertukel Ki = A. Kizilirmak Vo = H. Vogel Er = A.Y. Ertan Mi = P. Mittermeier We = Th. Weber Gd = N. Gudur Od = O. Demircan