COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS NUMBER 456 Konkoly Observatory Budapest 1970 July 26 PHOTOELECTRIC MINIMA OF ECLIPSING BINARIES Introduction Since 1963 photoelectric observations of eclipsing binaries were made at the Nurnberg Observatory Germany. The photometer with 1921 multiplier is mounted at a 34 cm Cassegrain-telescope. In 1965 a cooperation was arranged between the Nurnberg Observatory and a group of observers at the Ege University Observatory, Izmir/Turkey, where till August 1967 visual minima were derived. In the year 1968 a, new 48 cm Cassegrain-telescope with photoelectric photometer (1P21) was mounted at the Ege University Observatory, which has very good climatic conditions. The complete instrument was financed by a NATO-Research Grant. This telescope is used by both observatories for the common program. Minima of eclipsing binaries, observed at the Izmir- and Nurnberg- Observatory 1960-1967 were published in Astron. Nachr. 288.69 (1964), 289.191 (1966) and 291.111 (1968). Observations All minima listed here are photoelectric obtained during the period 1968/69. No filter were used, except for stars brighter than 7m0 (Schott GG 11 = GG 495). In Nurnberg a Siemens-Kompensograph, in Izmir a Philips-recorder were used to record the measurements. The table gives besides the heliocentric minima three different O-C's (see remarks at the end of table), the abbreviations of the names of the observers and the type of the instruments used (Izmir: 48 cm Cassegrain, Nurnberg: 34 cm Cassegrain). Abbreviations of the Observers' Names Al = A. Caliskan, Izmir Ib = C. Ibanoglu, Izmir Ba3~ = H. Baumbach, Nurnberg Ki = A. Kizilirmak, Izmir Bi = A. Bickel, Nurnberg Kt = M. Kurutac, Izmir En = C. Endres, Nurnberg Ly = H. Loy, Nurnberg Gd = N. Gudur, Izmir Me = M. Meier, Nurnberg Gl = O. Gulmen, Izmir Od = O. Demircan, Izmir Gn = E. Gencer, Izmir Pl = E. Pohl, Nurnberg Go = G. Gorz, Nurnberg Ro = B. Roth, Nurnberg Gr = G. Grampp, Nurnberg Rz = H. Renz, Nurnberg Hd = K. Held, Nurnberg Zk = Z. Cetinkaya, Izmir Ho = D. Holzl, Nurnberg Star Min(helioc.) O-C(1) O-C(II) O-C(III) Observ Instr.cm RT And 2440 115.4755 -0d0293 -0d0016 Gd 48 439.375 -0.030 -0.002 Gl/Od 48 XZ And 40 484.393 +0.072 -0.007 Gl 48 AB And 40 433.4725 +0.0726 +0.0023 Ib 48 474.2940 +0.0719 +0.0010 Ib 48 BX And 40 100.398 +0.042 +0.005 Gd/Ib 48 103.448 +0.041 +0.005 Gd/Ib 48 133.344 +0.042 +0.005 Gd/Ib 48 496.363: +0.044: +0.005: Ki/Od 48 RY Aqr 40 476.324 -0.005 -0.009 Ib 48 KO Aql 40 435.4076 +0.0200 +0.0575 Al/Ib 48 KP Aql 40 098.471: +0.0066 +0.031: Ib/Kt 48 OO Aql 40 068.4638 -0.0380 -0.0165 -0.0002 Ib/Kt 48 366.454 -0.044 -0.021 0.000 Ib 48 V337 Aql 40 408.370: -0.025:= -0.025: Gd/Od 48 V346 Aql 40 149.306 -0.024 -0.009 Pl 34 421.4738 -0.0222 -0.0072 Al/Gl 48 V805 Aql 40 036.441 +0.014 = +0.014 Ib/Kt 48 SX Aur 40 162.3358 +0.0172 +0.0141 Gd/Ib 48 289.396 +0.019 +0.016 Go/Me 34 491.478 +0.018 +0.015 Ib 48 WW Aur 40 288.298 +0.004 -0.001 Bi/Rz 34 AR Aur 40 498.4683 +0.0186= +0.0186 Gl 48 i Boo 39 948.363 +0.010 -0.003 Bi 34 956.400 +0.013 0.000 Go/Me 34 959.349 +0.016 +0.003 Go/En 34 959.481 +0.014 +0.001 Go/En 34 968.453 +0.014 +0.001 Bi/Me 34 977.292 +0.016 +0.002 Kt/Pl 48 40 316.346: +0.021 +0.007: Pl/Gd/Ib 48 319.296: +0.022 +0.008: Pl/Kt/Ib 48 331.346 +0.021 +0.006 Gd 48 363.484: +0.021 -0.006 Ba/Me 34 SV Cam 39 945.3718 -0.0198 +0.016 Ho/Me 34 977.3980 -0.0195 +0.0017 Kt/Pl 48 40 092.4561 -0.0176 +0.0041 Gd/Ib 48 127.4466 -0.0184 +0.0034 Ib 48 R CMa 39 935.307: +0.012: -0.001: Go/Ho 34 RZ Cas 40 054.4168 -0.0353 -0.0068 Ki/Kt 48 127.3272 -0.0353 -0.0068 Ib 48 TV Cas 40 056.4558 +0.0038= +0.0038 Gd/Kt 48 105.396 +0.004 = +0.004 Gd/Ib 48 105.3977 +0.0053= +0.0053 Bi/Me 34 203.2770 +0.0036= +0.0036 Hd/Pl 34 493.293 +0.002 = +0.002 Gl 48 TW Cas 2440 104.432 -0.010 -0.011 Gd/Ib 48 204.413 -0.012 -0.012 Bi 34 AB Cas 40 475.5216 +0.0763 +0.0108 Gi 48 DO Cas 39 917.284: +0.047: 0.000: Bi/Me 34 40 051.475 +0.045 -0.003 Kt/Ib 48 114.4687 +0.0498 +0.0005 Kt/Gd 48 518.423 +0.055 +0.002 Gd 48 PV Cas 40 129.381 +0.061 +0.002 Ib 48 227.4061 +0.0603 +0.0002 Ib/Kt 48 416.456 +0.060 -0.001 Al/Ib 48 479.475 +0.063 +0.001 Ib/Od 48 U Cep 40 086.4908 +0.1455 +0.0212 Gd/Ib 48 101.4483 +0.1452 +0.0207 Bi/Ho 34 136.3542 +0.1496 +0.0242 Gd 48 141.335 +0.144 +0.019 Gd 48 VW Cep 39 987.4237 -0.0832 -0.007 -0.0003 Gd/Pl 48 40 078.433 -0.084 -0.008 0.000 Gd/Ib 48 137.453 -0.086 -0.009 0.000 Ib 48 358.4148 -0.0916 -0.0128 -0.0017 Ib 48 388.477 -0.088 -0.009 +0.003 Ib/Zk 48 490.3378 -0.0919 -0.0121 +0.0005 Gd 48 XX Cep 40 097.373 -0.090 -0.017 Ib/Ki 48 139.442 -0.093 -0.020 Gd/Ib 48 513.419 -0.090 -0.016 Ba/Go 34 ZZ Cep 40 042.4714 0.0 = 0.0 Gd/Ib 48 EG Cep 40 050.4550 +0.0071 Gd 48 201.316 +0.008 Bi/Me 34 433.3246 +0.0087 Ib 48 483.4284 +0.0075 Gl 48 U CrB 40 371.3752: -0.0219: -0.0246 Ib 48 Y Cyg 40 345.4774 -0.0051 +0.0086 Gd/Ib 48 381.424: -0.015: -0.001: Pl 34 384.428 -0.007 +0.007 Ki/Zk 48 423.3794 -0.008 +0.006 Gd/Od 48 BR Cyg 40 377.4698 +0.0097= 0.0097 Gd/Ki 48 437.4371: +0.0117= 0.0117 Od 48 501.398: +0.010 = +0.010: Me/Ro 34 KR Cyg 40 420.4578 -0.0188 +0.0093 Al/Gl 48 MR Cyg 40 074.355 +0.002 = +0.002 Gd/Ib 48 364.480 0.000 = 0.000 Kt 48 V477 Cyg 39 983.4555 -0.0647 -0.0196 +0.0012 Kt 48 40 091.4174 -0.0655 -0.0204 +0.0017 Kt/Gn 48 382.4425 -0.0704 -0.0253 +0.0003 En/Gr 34 422.3434: -0.0687: -0.0237: +0.0024: Gd/Od 48 V548 Cyg 40 109.474: -0.054: -0.021: Bi/Ho 34 185.295 -0.054 -0.021 Ib/Kt 48 378.462 -0.050 -0.016 Ib 48 434.421 -0.055 -0.021 Al/Od 48 V836 Cyg 2440 057.444 -0.004 Gd 48 406.369: 0.000: Gl/Ki 48 Z Dra 39 346.3956 +0.0086 -0.0016 Ib 48 TW Dra 39 979.3515 -0.0084 -0.009 -0.0006 Pl 48 40 080.3995 -0.0077 -0.0085 +0.0013 Gn/Kt 48 473.352: -0.017 -0.018 +0.003 Me/Pl 34 TZ Dra 40 394.353 -0.002 +0.001 Al/Gd 48 419.4667 -0.0031 -0.0004 Ho/Ly 34 AI Dra 40 094.3910 +0.0174 +0.0060 Gd/Ib 48 106.3783 +0.0165 +0.0052 Kt/Ib 48 438.4491 +0.0160 +0.0046 Ho/Me 34 S Equ 40 411.387 +0.003 -0.004 Gd 48 YY Eri 40 201.4399 +0.0221= +0.0221 Ba/Bi 34 RX Her 40 037.4659 -0.0041 -0.0011 Gd/Ib 48 110.3909: -0.0005: +0.0025: Go/Me 34 334.4895 -0.0021 +0.0010 Ib 48 TX Her 39 979.518 -0.013 -0.004 Gd 48 40 008.3573 -0.0115 -0.0018 Kt/Gd 48 389.4232 -0.0105 -0.0008 Gd/Gl 48 426.5015 -0.0087 +0.0009 Ho/Ro 34 UX Her 40 022.4201 -0.0320 -0.0002 Gd/Kt 48 039.4564: -0.0331: -0.0004: Ba/Me 34 053.397 -0.032 0.000 Gd/Kt 48 403.4372 -0.0309 -0.0335 -0.0001 Al/Ib 48 431.3161: -0.0316: -0.0341: -0.0005 Ib 48 AK Her 39 980.419 +0.036 -0.011 +0.002 Gd/Kt 48 981.4730 +0.0358 -0.0105 +0.0018 Kt/Gd 48 40 368.429 +0.035 -0.014 0.000 Kt 48 392.455 +0.034 -0.015 0.000 Ib 48 SW Lac 40 035.4224 -0.0028 Gd 48 128.4540 -0.0023 Gd/Ib 48 202.2197: -0.0040: Pl 34 373.4866 -0.0062 Ib/Kt 48 419.3502 -0.0067 Gd/Od 48 497.2869 -0.0070 Gd 48 515.246 -0.009 Pl 34 AR Lac 39 876.2684 +0.041 -0.002 Me/Pl 34 CM Lac 40 048.386 -0.002= -0.002 Ib/Kt 48 401.4195 -0.0010= -0.0010 Ib 48 UV Leo 39 940.3390 -0.0058 +0.0064 Bi/Pl 34 978.445 -0.006 +0.006 Kt/Pl 48 40 291.3880 -0.0068 +0.0060 Ib/Kt 48 TZ Lyr 40 418.417 +0.031 +0.030 Al/Gi 48 FL Lyr 40 079.519 -0.002 +0.004 Ib/Kt 48 395.355 +0.001 +0.003 Al/Gd 48 U Oph 40 075.404 -0.013 +0.003 Gn/Kt 48 V451 Oph 2440 410.4204 +0.0074 -0.0242 Ib 48 477.405 -0.004 +0.036 Me 34 V566 Oph 40 047.358 +0.115 +0.002 Gd 48 049.4057 +0.1140 +0.0016 Kt/Ib 48 418.4931 +0.0957 +0.0024 Ba/Me 34 FT Ori 40 274.3917 +0.0163 +0.0163 Ho/Me 34 U Peg 40 096.4534 -0.0081 -0.0044 Kr 48 205.328 -0.008 -0.004 En/Me 34 UX Peg 40 425.479 -0.056 0.000 Gl/Od 48 AT Peg 40 407.438 -0.021 -0.044 Ib 48 438.383 -0.020 -0.044 Ib 48 DI Peg 40 424.4746 -0.0056 +0.0218 Gd/Gl 48 beta Per 39 918.358 -0.006 +0.019 En/Go 34 40 285.368 -0.016 +0.013 Go/Me 34 V505 Sgr 40 055.3991 -0.0264= -0.0264 Gd/Ib 48 087.3367 -0.0264= -0.0264 Gd/Ib 48 RW Tau 40 160.3758 +0.0108 +0.0218 Gd/Ib 48 CD Tau 40 135.425 -0.051 -0.011 Gd 48 W UMa 39 940.4262 +0.0091 -0.0004 Bi 34 992.4750 +0.0103 +0.0008 Kt 48 40 293.416 +0.010 0.000 Gd/Ib 48 322.4450 +0.0127 +0.0024 Ib/Kt 48 TX UMa 40 357.343 -0.056 +0.001 Gd 48 W UMi 40 325.3284 -0.0058= -0.0058 Ib 48 AH Vir 40 349.4590 +0.0573 +0.0008 Gd/Ki 48 Z Vul 40 362.4366 +0.0089= +0.0089 Ib 48 362.439 +0.011 = +0.011 Ly/Rz 34 RS Vul 40 514.317 +0.001 = +0.001 Bi/En 34 DR Vul 40 109.3523 +0.0403 Gd 48 370.441 +0.031 Gd/Ki 48 Remarks concercing O-C O-C (I): GCVS, Moscow 1958; O-C (II): SAC 39/40, Krakow 1967/68; O-C (III): new elements, published in IBVS by Ibanoglu, Kurutac, Pohl: 00 Aql IBVS 391 (1969) Pohl i Boo IBVS 209 (1967) Pohl PV Cas IBVS 386 (1969) Pohl VW Cep IBVS 369 (1969) Kurutac, Ibanoglu V 477 Cyg IBVS 226 (1967) Pohl TW Dra IBVS 443 (1970) Pohl UX Her IBVS 369 (1969) Kurutac, Ibanoglu AK Her IBVS 369 (1969) Kurutac, Ibanoglu TX UMa IBVS 185 (1967) = SAC 41 (1970) Pohl The (O-C)' s for secondary minima (especially for W UMa-stars) were calculated on the supposition that they are symmetric between primary minima. 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 P. K. 21 85 Nurnberg Bornova/Izmir Germany Turkey