COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS NUMBER 775 Konkoly Observatory Budapest 1973 March 15 MINIMA OF ECLIPSING VARIABLES This report continues the ones in IBVS 187 and 299 and contains 48 observed minima of 11 eclipsing variable stars. The observations are photographic (pg) or photoelectric (pe). The photoelectric observations were made using a 50 cm Newton reflector and a photometer employing an unrefrigerated 1P21 photomultiplier tube. The heliocentric moments of minima were determined by the method of the mean light curve (Todoran 1969) and that of the bisection curve (Todoran 1968). Elements in the General Catalogue of Variable Stars were used to compute O-C's for: U Cep, V477 Cyg, W Del, and UX UMa; for the other stars the author's elements given in IBVS 299 and 636 were used. The number of observations is given under n. J.D. hel. O-C E n (2400000) ------------------------------------------- XZ Andromedae ------------- 39865.4720 pg +0.0054d 2496 15 40070.4145 " -0.0036 2647 6 40093.4890 " -0.0031 2664 10 40127.4215 " -0.0029 2689 14 40135.5675 " -0.0007 2695 7 40138.2800 " -0.0028 2697 10 40157.2900 " +0.0051 2711 17 40446.3850 " -0.0036 2924 13 40454.5260 " -0.0064 2930 6 U Cephei ---------- 41198.4067 pe +0.0189 1166 20 41218.3500 " +0.0179 1174 16 41223.3360 " +0.0178 1176 30 RW Coronae Borealis ------------------- 41445.4531 pe -0.0045 28970 29 41464.3405 " -0.0037 28996 16 41469.4255 " -0.0036 29003 17 ZZ Cygni -------- 40115.3805 pg +0.0032 30190 11 40139.2665 " +0.0019 30228 11 40430.3150 " +0.0012 30691 6 40445.4010 " +0.0004 30715 15 40467.4030 " +0.0009 30750 10 40682.3900 " +0.0012 31092 11 40731.4215 " +0.0008 31170 14 V477 Cygni ---------- 41464.4060 pe -0.0136 3672 7 41478.4896 " -0.0119 3678 32 W Delphini ---------- 39709.562 pg +0.107 4507 39978.700 " +0.107 4563 11 40031.557 " +0.097 4574 9 40079.600 " +0.080 4584 10 40113.237 " +0.074 4591 10 40137.266 " +0.073 4596 18 40161.300 " +0.077 4601 6 Z Draconis ---------- 40654.5375 pg +0.0015 5441 9 40684.3935 " +0.0092 5463 6 41064.4795 " +0.0064 5743 12 RZ Draconis ----------- 41236.440 pe -0.0062 21398 25 TU Herculis ----------- 40153.261 pg -0.025 1187 5 40681.455 " -0.036 1420 12 40697.312 " -0.048 1427 6 41062.309 " -0.033 1588 7 41071.380 " -0.030 1592 5 CC Herculis ------------ 40677.5485 pg +0.0180 8395 5 40710.4850 " +0.0088 8414 10 41036.4775 " +0.0120 8602 18 41062.4890 " +0.0136 8617 10 41083.3020 " +0.0188 8629 6 UX Ursae Majoris --------------- 40600.605 pg 0.000 16127 9 40653.506 " -0.004 16396 7 40656.455 " -0.005 16411 6 ------------------------------------------ IOAN TODORAN Astronomical Observatory Cluj, Rumania References : Todoran, I., 1968 Acta Astronomica 18, 61. [BIBCODE 1968AcA....18...61T ] Todoran, I., 1969 Studii si Cercetari de Astronomie 14, 35. [BIBCODE 1969StCeM..14...35T ]