COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS NUMBER 647 Konkoly Observatory Budapest 1972 March 25 PHOTOELECTRIC MINIMA OF ECLIPSING BINARIES The following Table gives photoelectric minima obtained during the year 1971 at the Ege University Observatory, Izmir (Turkey) and the Nurnberg Observatory (Germany). Minima of eclipsing binaries observed at both Observatories 1960 - 1970 were published in Astr. Nachr. 288, 69 (1964); 289, 191 (1966); 291, 111 (1968); IBVS 456 (1970) and 530 (1971). The Table gives besides the heliocentric minima three different O-C's: 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 observers' names: Bz = S. Bozkurt, Izmir; Dn = H. Donmez, Izmir; En = C. Endres, Nurnberg; Gd = N. Gudur, Izmir; Gl = O. Gulmen, Izmir; Go = G. Gorz, Nurnberg; Gp = G. Grampp, Nurnberg; Gr = R. Grobel, Nurnberg; Hl = H. Sengonca, Izmir; Ho = D. Holzl, Nurnberg; Hk = W. Huck; Hs = H. Karacan, Izmir; Hu = R. Hufnagl; Ib = C. Ibanoglu, Izmir; Ki = A. Kizilirmak, Izmir; Me = M. Meier, Nurnberg; Od= O. Demircan, Izmir; Pl = E. Pohl, Nurnberg; Ra = K. Raschzok, Nurnberg; Rk = R. Akinci, Izmir; Ro = B. Roth, Nurnberg; Sc = H. Schoppner, Nurnberg; Wg = G. Weigelt, Nurnberg; Wu = J. Wunner, Nurnberg; Zk = Z. Hasan, Izmir. Remarks: 1) B filter, 2) V filter, 3) Min II, 4) O-C calculated with elements from SAC 43 (Ibanoglu). O-C(I): GCVS, Moscow 1969/70, O-C(II): SAC 42, Krakow 1971, O-C(III): new elements: KP Aql IBVS 502 (1970) Ibanoglu and Gulmen = SAC 43 i Boo IBVS 209 (1967) Pohl VZ CVn AJ 73 (1968) Harris RZ Cas Scientific Reports of the Faculty of Science, Ege University No. 120, Astronomy No. 12 (1971) A. Kizilirmak PV Cas IBVS 386 (1969) Pohl = SAC 43 VW Cep IBVS 369 (1969) Ibanoglu and Kurutac = SAC 43 AK Her IBVS 369 (1969) Ibanoglu and Kurutac The (O-C)'s for secondary minima were calculated on the supposition that they are symmetric between primary minima (if not special data 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 is uncertain. Star Min (hel.) O-C(I) O-C(II) O-C(III) Obs. Inst. Re- 244... cm marks RT And 1300.3803: -0.0017: -0.0056: Hk/Hu 34 AB And 233.3337 +0.0186 +0.0034 Rk/Zk 48 BX And 186.4006 +0.0024= +0.0024 Hl/Rk " KO Aql 148.560 +0.071 +0.099 Ho/Hk/Me 34 KP Aql 125.549 +0.036 = +0.036 0.000 Gl/Ib 48 1) .548 +0.035 = +0.035 -0.001 Gl/Ib " 2) 157.536 +0.032 = +0.032 -0.004 Hs/Rk " 1) .536 +0.032 = +0.032 -0.004 Hs/Rl: " 2) 238.359 +0.036 = +0.036 0.000 Hs/Rk " OO Aql 161.3518 -0.0230 +0.0021 Gd/Rk " 3) 179.3457 -0.0203 +0.0050 Hl/Hs " 182.3845 -0.0223 +0.0031 Hl/Rk " 187.4531 -0.0216 +0.0038 Hl " V337 Aql 168.401 -0.015 = -0.015 Gd/Hl " V346 Aql 159.4178 -0.0082 -0.0086 Ho/Pl 34 210.3100 -0.0088 -0.0092 Hs/Rk 48 WW Aur 024.3382 +0.0015 +0.0011 En/Hu 34 2) 3) i Boo 138.406 +0.010 +0.011 +0.007 Gr/Hk/Hu " 2) 3) 139.345 +0.011 +0.012 +0.009 Gl 48 141.4886: +0.0125: +0.0135: +0.0103: Me/Wu 34 2) 047.3915 -0.0217 -0.0014 Gd/Ki 48 090.3582 -0.0206 -0.0003 Hs/Ib " 1) .3584 -0.0204 -0.0001 Hs/Ib " 2) 103.4156 -0.0214 -0.0011 Gd/Ib " 1) 3) .4159 -0.0211 -0.0008 Gd/Ib " 2) 3) 111.420 -0.020 0.0000 Hs/Ib " 1) .421 -0.019 +0.001 Hs/Ib " 2) 116.4719 -0.0233 -0.0029 Hs/Ib " 1) .4733 -0.0219 -0.0015 Hs/Ib " 2) 119.4225 -0.0213 -0.0009 Hs/Ib " 1) 3) .4225 -0.0213 -0.0009 Hs/Ib " 2) 3) 125.318 -0.023 -0.003 Gl/Ib " 1) 3) .320 -0.021 -0.001 Gl/Ib " 2) 3) R CMa 0964.466 +0.009 -0.003 Hu/Me/Ro 34 2) RZ Cas 1162.406 -0.004 -0.007 +0.003 Bz/Ib 48 199.4583 -0.0040 -0.0079 -0.0030 Hl/Rk " TV Cas 0899.3175 -0.0049 +0.0020 Hs/Od " TW Cas 904.2934 -0.0111 -0.0129 Hs/Rk " 964.282 -0.012 -0.014 Me/Ro 34 1201.3842 -0.0121 -0.0143 Ho/Hu/Wg " DO Cas 200.3499 +0.0015= +0.0015 Hl/Rk 48 PV Cas 152.4924 +0.0274 -0.0360 -0.0107 Dn/Gd " .4924 +0.0274 -0.0360 -0.0002 Gd/Ib " 2) 3) 4) 181.4102 +0.0626 -0.0010 -0.0037 Dn/Rk " 195.4140 +0.0627 -0.0009 -0.0037 Dn/Rk " U Cep 203.3925 +0.0186 +0.0344 Rk " VW Cep 0903.3557 -0.0675 -0.0166 +0.0004 Hl/Hs " 2) 3) 1140.4822: -0.0678: -0.0162: +0.0034: Gp/Hu/Me 34 207.277: -0.069: -0.017: +0.003: Hl/Hs 48 217.298: -0.068: -0.016: +0.004: Rk " 248.328 -0.070 -0.018 +0.003 Gp/Ho/Hu 34 3) ZZ Cep 173.342 0.000 0.000 Gd/Hl 48 Y Cyg 1160.4962: -0.0079: +0.0287: Hk/Hu 34 169.4850 -0.0083 +0.0286 Gd/Hl 48 253.388: -0.005: +0.035: Ho/Hu 34 KR Cyg 174.3323 -0.0089 +0.0085 Gd/Hl 48 V548 Cyg 176.3699 -0.0524 -0.0130 Hl/Rk " 223.3051 -0.0539 -0.0145 Bz/Ib " TY Del 127.4965 +0.0020 +0.0179 Bz/Gl " TZ Dra 131.3522 +0.0054 +0.0057 Gd/Hs " Ai Dra 137.3594 +0.0058 +0.0066 Rk " S Equ 222.3021 -0.0031 -0.0019 Gd/Hs " RX Her 202.4311 +0.0001 -0.0005 Gr/Hk/Wg 34 TT Her 163.3664 -0.0090= -0.0090 Ib/Hs 48 UX Her 097.321: -0.037: -0.002: Hs/Ib " AK Her 126.3280 -0.0174= -0.0174 +0.0001 Gd/Rk " 188.292 -0.018 = -0.018 0.000 Hl/Ib " 246.253 -0.016 = -0.016 +0.002 Ib/Rk " 3) EZ Hya 0981.5289 -0.0464= -0.0464 Hs/Ib " 1) .5297 -0.0456= -0.0456 Hs/Ib " SW Lac 1167.4277 -0.0256 -0.0280 Hl/Rk " 3) 172.4009 -0.0237 -0.0261 Hl/Rk " 2) 172.4013 -0.0233 -0.0257 Hl/Rk " 1) 249.3737 -0.0257 -0.0280 En/Hu 34 UV Leo 060.395 -0.006 +0.005 Ho/Sc " 3) AM Leo 0977.342: -0.023:= -0.023: Gd/Ki 48 3) TZ Lyr 1126.5167 +0.0168 +0.0052 Gd/Rk " 135.5070 +0.0171 +0.0055 Hs/Ib " U Oph 135.4868: -0.0087: -0.0025: En/Gr/Hk 34 2) 204.258 -0.009 -0.002 Gl/Hl 48 V566 Oph 136.3852 -0.0013= -0.0013 Hs/Rk " 3) 139.4564 -0.0025= -0.0025 Gl " U Peg 185.3804 -0.0063 -0.0063 Hl/Rk " 3) 198.311 -0.006 = -0.006 Bz/Ib " Beta Per 260.256 -0.040 -0.001 Hu/Pl 34 2) UV Psc 163.4933 +0.0141= +0.0141 Hs/Ib 48 V505 Sgr 155.4669 -0.0290 -0.0027 Gl/Ib " 1) .4669 -0.0290 -0.0027 Gl/Ib " RS Sct 156.5006 +0.0156 +0.0207 Gd/Ib " 188.382 +0.014 +0.019 Hl/Ib " X Tri 0981.3066 -0.0203= -0.0203 Ho/Hu 34 W UMa 1055.4444 -0.0593 -0.0017 En/Go/Hu " 079.468 -0.058 0.000 Hs/Rk 48 133.3481 -0.0621 -0.0026 Rk " 3) TX UMa 0985.3034: -0.0038 -0.0035: Me/Ra 34 AH Vir 1059.366 +0.005 = +0.005 Hu/Me " DR Vul 124.459 +0.016 -0.010 Gd/Hs 48 177.4097 +0.0551 +0.0464 Gd/Hs " 3) 240.434: +0.056: +0.047: En/Go/Hu 34 3) E. POHL Nurnberg Observatory Lutzowstr. 10., 85 Nurnberg, Germany A. KIZILIRMAK Ege University Observatory Bornova/Izmir P.K. 21, Turkey [From IBVS 937] Correction for Bulletin Nr. 647 The minima for i Boo ends with J.D. 2441 141.4886: From 2441 047.3915 to .... 125.320 minima of the star VZ CVn are given. A. KIZILIRMAK E. POHL Ege University Observatory Nurnberg Observatory Bornova/Izmir P.K. 21, Turkey Lutzowstr. 10., 85 Nurnberg, F.R.G.