COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS Number 1163 Konkoly Observatory Budapest 1976 August 3 PHOTOELECTRIC MINIMA OF ECLIPSING BINARIES The following Table gives photoelectric minima obtained during the year 1975 at the Ege University Observatory, Izmir (Turkey) and the Nurnberg Observatory (Germany). Minima of eclipsing binaries observed at both observatories 1960-1974 were published in Astr.Nachr. 288, 69 (1964); 289, 191 (1966); 291, 111 (1968); IBVS 456 (1970), 530 (1971), 647 (1972), 937 (1979) and 1053 (1975). 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, or 15 cm refractor, Nurnberg: 34 cm Cassegrain, all with phototube 1P21). Abbreviations of the observers' names: Ad = A. Durgut Ki = A. Kizilirmak Ar = G. Arneth Nc = N. Damla Be = G. Besold Nr = N. Celikezer Bo = G. Bode Od = O. Demircan Eb = J. Ebersberger Rd = E. Roderer Er = A.Y. Ertan Sb = R. Sendelbeck Gd = N. Gudur Sc = H. Schellemann Gl= O. Gulmen Si = B. Schieweck Gn = G. Isik Sr = C. Sezer Gr = R. Grobel Tn = Z. Tunca He = W. Hetterich We = Th. Weber Ib = C. Ibanoglu Remarks: O-C (I) : GCVS, Moscow 1969/70 or First or Second Supplement to the Third Edition of the GCVS. Moscow 1971 and 1974. O-C (II): SAC 97, Krakow 1975 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 AG Per : The elements with third term (First Supplement to the third edition of GCVS Moscow 1971) give O-C of about. -0.035d for Min. I, about -0.050d for Min.II. 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 (last decimal) is uncertain. E. POHL A. KIZILIRMAK Nurnberg Observatory Ege University Observatory Lutzowstr. 10, 85 Nurnberg Bornova/Izmir P.K. 21, Turkey F.R.G. Star Min.hel. O-C (I) O-C (II) O-C(III) Filt. Obs. Instr. Rem cm 2442 RT And 717.3586 +0.0001 -0.0122 Gr/He 34 OO Aql 301.3758 +0.0001(m) +0.0092 B,V Gd/Od 48 311.2580 -0.0001 +0.0090(m) B,V Gd/Od " i Boo 449.501 +0.020 +0.008. +0.018 V Eb 34 465.4365: +0.0209: +0.0087: +0.0182: V Gr " MinII. 465.567: +0.017: +0.005: +0.015: V Gr/Rd " 581.397 +0.018 +0.006 +0.015 Gd/Ki 15 MinII 600.4137: +0.0198: +0.0081: +0.0170: V Eb 34 MinII SV Cam 517.5142 -0.0094 -0.0051 B,V Er/Gl/Nr 48 545.3909 -0.0071 -0.0028 B Gl/Nr/Tn " 545.3895 -0.0085 -0.0042 V Gl/Nr/Tn " 771.350 -0.008 -0.004 B,V Gl/Nr " 777.2786 -0.0105 -0.0058 B Gl/Nr " 777.2792 -0.0099 -0.0052 V Gl/Nr " RZ Cas 454.4755: +0.0036: -0.0049: +0.0064: Ar/We 34 TV Cas 590.4729 -0.0149 -0.0073 Bo/Eb " 659.3506 -0.0164 -0.0088 B Ad/Gd/Nc 48 659.3513 -0.0157 -0.0081 V Ad/Gd/Nc " U Cep 452.417 +0.030 +0.003 Ar/Rd 34 VW Cep 434.3686 +0.0080 = +0.0080 Gd/Ki 15 449.4002 +0.0106 = +0.0106 B Sr " 449.3967 +0.0071 = +0.0071 V Sr " 530.388: +0.009: = +0.009: Eb/Rd/Sc 34 556.405 +0.004 = +0.004 B Ib/Sr 15 MinII 556.409 +0.008 = +0.008 V Ib/Sr " MinII 556.550 +0.009 = +0.009 B Ib/Sr " 556.546 +0.005 = +0.005 V Ib/Sr " 562.397 +0.012 = +0.012 B,V Sr " 606.513: +0.015: = +0.015: Ar/Eb 34 477 Cyg 628.5150 +0.0057 = +0.0057 Eb/He " 548 Cyg 575.443 +0.005 -0.016 Eb/Gr " Star Min.hel. O-C (I) O-C (II) O-C (III) Filt. Obs. Instr. Rem cm 2442 548 Cyg 631.4055 +0.0053 -0.0169 B Er/Gn/Sr 48 631.4052 +0.0050 -0.0172 V Er/Gn/Sr " 640.4317 +0.0053 -0.0170 B Er " 640.4324 +0.0060 -0.0163 V Er " 667.5126 +0.0075 -0.0150 B Er/Gn/Nc " 667.5122 +0.0071 -0.0154 V Er/Gn/Nc " RX Her 583.4931 +0.0007 +0.0003 Bo 34 MinII TX Her 561.540 +0.037 +0.046 Be/Eb " MinII AK Her 532.5291 +0.0001 = +0.0001 Eb/Sb " SW Lac 630.3750 -0.0177 = -0.0177 B,V Gd 48 697.4039 -0.0192 = -0.0192 Eb/Si 34 UV Leo 453.4937 -0.0055 +0.0077 Be 34 508.419: +0.012: +0.025: Be/Rd " MinII AM Leo 493.392 +0.002 -0.004 Eb/Rd " 521.375 +0.001 -0.004 Gr/Rd " MinII RR Lyn 472.3982: +0.0018: -0.0034: Eb/Rd/We " 502 Oph 570.4558: +0.0069:= +0.0069: Eb/Gr/Rd " MinII FT Ori 451.3304 +0.0166 = +0.0166 Eb/Gr " AT Peg 712.2435: +0.0338: -0.0118: Eb " AG Per 377.3459 -0.0121 Gd 15 384.4722 +0.0136 B,V Gd/Tn 48 MinII 386.504: +0.017: B Gd/Sr " MinII 386.500: +0.013: V Gd/Sr " MinII 668.4971 +0.0164 B,V Ga " MinII 727.3307 +0.0169 B,V Gd " MinII 728.3113 -0.0169 B,V Ad/Gd/Gn " DM Per 711.5013 +0.0476 +0.0027 Be/He/Si 34 IZ Per 630.4953 +0.0155= +0.0155 Eb/He/Sc " Star Min.hel. O-C (I) O-C (II) O-C (III) Filt. Obs. Instr. Rem cm 2442 Beta Per 725.4604: +0.0022: -0.0048: V Eb/He/Sc 34 471 Tau 720.334: -0.002: B Er/Ib 48 723.464: +0.001: B Er/Ib " W Uma 450.3821 -0.0068 -0.0062 Be/Bo 34 AG Vir 451.480 +0.006 -0.006 Eb/Gr " MinII AH Vir 501.408 +0.032 +0.031 Eb/Rd " MinII [From IBVS 1203] Correction to I.B.V.S. No. 1163 The minimum of TX Her is erroneously given. It should be read : Min.hel. 2442561.498; O-C (I)= -0.005d; O-C (II)= +0.004d E. POHL A. KIZILIRMAK Nurnberg Observatory Ege University Observatory