COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS NUMBER 844 Konkoly Observatory Budapest 1973 November 4 TIMES OF MINIMA OF SOME ECLIPSING VARIABLES Times of minima of several eclipsing variables have been observed at the University of Victoria in 1969, 1970, 1971 and 1973. The equipment used was described by Scarfe and Brimacombe (A.J. 76, 50, 1971). All the times of minima listed in table 1 were calculated by the method of Kwee and van Woerden (BAN 12, 327, 1956) using a programme written by one of us (B.W.B.) for the University of Victoria's IBM 370 computer. The ephemerides used to find the O-C's in column 4 of table 1, as well as references for them, are given in table 2. Table 1, Observed Times of Minima Star H.J.D. E O-C Observer (2,440,000+) (days) 44i Boo 801.7627 +/-0.0005 8544.5 +0.0074 N 812.7448 +/-0.0007 8585.5 +0.0091 N 1110.8264 +/-0.0013 9698.5 +0.0134 S 1131.8469 +/-0.0004 9777 +0.0105 N 1147.7804 +/-0.0004 9836.5 +0.0090 S 1814.7746 +/-0.0006 12327 +0.0117 Br 1816.7854 +/-0.0006 12334.5 +0.0139 Br 1818.7946 +/-0.0006 12342 +0.0145 S 1827.7682 +/-0.0008 12375.5 +0.0163 Br 1829.7737 +/-0.0005 12383 +0.0132 S U Cep 512.8046 +/-0.0007 13086 +0.4130 S 1190.9261 +/-0.0002 13358 +0.4655 Bl 1210.8706 +/-0.0003 13366 +0.4668 Bl 1215.8567 +/-0.0002 13368 +0.4671 Bl 1938.8476 +/-0.0003 13658 +0.5169 Bl VW Cep 799.8225 +/-0.0002 5157 +0.0008 N 802.7478 +/-0.0007 5167.5 +0.0038 N 806.7797 +/-0.0006 5182 +0.0002 N 811.7900 +/-0.0003 5200 +0.0008 N 817.7761 +/-0.0001 5221.5 +0.0032 N 817.9134 +/-0.0002 5222 +0.0013 N 823.7579 +/-0.0002 5243 +0.0012 N 1139.7890 +/-0.0009 6378.5 +0.0071 N 1139.9250 +/-0.0003 6379 +0.0039 N 1842.8107 +/-0.0002 8904.5 +0.0083 Br 1880.8027 +/-0.0005 9041 +0.0105 S U CrB 1099.7889 +/-0.0012 10704 +0.0028 N MR Cyg 1146.8181 +/-0.0007 4621.5 +0.0003 N AI Dra 1875.8287 +/-0.0003 3613 -0.0001 Br Z Her 1111.8211 +/-0.0003 7019 +0.0015 N RX Her 513.8142 +/-0.0002 4741.5 +0.0006 N 838.7135 +/-0.0003 4755.5 -0.0001 S Table 1 continued Star H.J.D. E O-C Observer (2,440,000+) (days) RX Her 1134.8458 0.0001 4922 -0.0001 N 1175.7531 0.0003 4945 +0.0001 N 1833.8250 0.0005 5315 +0.0003 Br 1889.8506 0.0007 5346.5 +0.0009 Br U Oph 1117.8769 0.0002 19577.5 -0.0074 N 1133.8082 0.0004 19587 -0.0109 N 1866.8090 0.0003 20024 -0.0103 Br V566 Oph 1119.8018 0.0004 10681 +0.0073 N 1145.8170 0.0005 10744.5 +0.0102 N 1835.8616 0.0002 12429 +0.0147 S 1843.8498 0.0002 12448.4 +0.0149 S 1877.8508 0.0002 12531.5 +0.0157 Br EE Peg 1174.7726 0.0003 704 +0.0052 N U Sge 422.8795 0.0004 6890 +0.0036 S 821.7923 0.0002 7008 +0.0035 N 1132.8083 0.0002 7100 +0.0026 N 1896.8276 0.0001 7326 +0.0021 Br RS Vul 809.8450 0.0005 1787 +0.0033 N 818.8001 0.0003 1789 +0.0031 N Observers: Bl = B.W. Baldwin, Br = D.J. Barlow, N = R.J. Niehaus, S = C.D. Scarfe. Table 2, Ephemerides for the Systems Studied Star (H.D.J.)_o Period References (2,400,000+) 44i Boo 38,513.4160 0.26781430d Pohl IBVS 209.1967 U Cep 7,890.2957 2.4929005 Svechnikov PZ 10,262,1955 VW Cep 39,364.5578 0.27831373 Scarfe and Brimacombe AJ 76, 50,1971. U CrB 4,147.4297 3.4522008 Hellerich AN 220,331,1924 MR Cyg 33,396.4069 1.67703362 Battistini et al. Ap.Sp.Sc. 19,395,1972 AI Dra 37,544.5095 1.19881520 Winiarski Act.Ast.21,517,1971 Z Her 13,086.348 3.9928012 Plavec et al.BAC 12,125,1961 RX Her 32,380.7145 1.7785720 Wood ApJ 110,465,1949 U Oph 8,279.643 1.6773460 Parenago PZ 7,102,1949 V566 Oph 36,744.4200 0.40964091 Bookmyer AJ 74,1197,1969 EE Peg 39,324.509 2.628208 Wellmann ZfAp 32,1,1953 U Sge 17,130.4151 3.3806184 Svechnikov PZ 10,262,1955 RS Vul 32,808.257 4.4776635 Martynov PZ 9,343,1953 C.D. SCARFE, R.J. NIEHAUS, D.J. BARLOW and B.W. BALDWIN University of Victoria, Victoria, B.C., Canada