COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS NUMBER 119 Konkoly Observatory Budapest 27 December 1965 MINIMA OF ECLIPSING VARIABLES This report continues the one in IBVS # 114, and contains 110 observed minima of 24 eclipsing variable stars. All are visual timings reduced by the tracing-paper method, except where noted. Elements in the 1958 General Catalogue of Variable Stars were used to compute O-C' s unless otherwise specified. The number of estimates used for each minimum is given under n. J. D. E O - C n Observer (+2400000) RT Andromedae 39045.662 +23733 -0.029 17 R. Swanberg 39045.663 +23733 -0.028 11 M. Baldwin 39050.696 +23741 -0.026 12 R. Monske 39052.586 +23744 -0.015 12 R. Monske 39062.649 +23760 -0.023 13 R. Monske 39064.535 +23763 -0.024 13 R. Monske 39069.567 +23771 -0.023 10 M. Baldwin 39077.745 +23784 -0.021 14 M. Baldwin XZ Andromedae 33559.527 + 498 +0.002 4 J. Ashbrook 33582.597 + 515 -0.002 4 J. Ashbrook 34266.653 +1019 -0.011 6 J. Ashbrook 37180.732 +3166 +0.008 21 J. Ashbrook 37562.638 +3440 +0.022 21 J. Ashbrook 39045.662 +4540 +0.048 29 M. Baldwin 39045.662 +4540 +0.048 18 R. Swanberg 39053.805 +4546 +0.047 13 R. Monske 39063.308 +4553 +0.049 7 T. de Menten 39064.664 +4554 +0.048 9 D. Williams 39064.665 +4554 +0.049 12 T. Cragg 39064.665 +4554 +0.049 15 R. Monske 39068.736 +4557 +0.048 26 R. Swanberg BX Andromedae 37180.688 +36865.5 +0.024 18 J. Ashbrook CX Aquarii 39036.663 +22852 +0.020 16 R. Monske 39036.666 +22852 +0.023 15 M. Baldwin 39046.673 +22870 +0.022 13 R. Monske 39050.564 +22877 +0.021 13 R. Monske 39051.673 +22879 +0.018 13 R. Monske OO Aquilae 37111.598 +5693 -0.003 12 J. Ashbrook 37112.604 +5695 -0.010 16 J. Ashbrook 37113.617 +5697 -0.011 15 J. Ashbrook 37118.690 +5707 -0.006 25 J. Ashbrook 37128.576 +5726.5 -0.002 15 J. Ashbrook 37132.620 +5734.5 -0.013 8 J. Ashbrook 37147.576 +5764 -0.007 5 J. Ashbrook 37148.588 +5766 -0.009 18 J. Ashbrook 37172.660 +5813.5 -0.010 22 J. Ashbrook 37199.509 +5866.5 -0.021 16 J. Ashbrook 37200.522 +5868.5 -0.021 11 J. Ashbrook 37201.548 +5870.5 -0.009 12 J. Ashbrook 37217.517 +5902 -0.004 12 J. Ashbrook 37508.650 +6476.5 -0.025 6 J. Ashbrook 37518.546 +6496 -0.012 6 J. Ashbrook 37539.573 +6537.5 -0.017 10 J. Ashbrook 39036.651 +9491.5 -0.014 13 M. Baldwin V346 Aquilae 39019.715 +6951 -0.014 12 T. Cragg 39029.670 +6960 -0.014 17 R. Monske 39050.693 +6979 -0.014 17 R. Monske 39059.547 +6987 -0.011 16 R. Monske SV Camelopardalis 38977.481 +11280 -0.015 9 A. Howell 39036.794 +11380 -0.010 11 M. Baldwin 39050.419 +11403 -0.025 12 A. Howell 39077.712 +11449 -0.014 12 M. Baldwin 39080.680 +11454 -0.011 12 M. Baldwin RZ Cassiopeiae 38665.534 +17829 -0.035 16 J. Ashbrook 39045.624 +18147 -0.036 15 M. Baldwin 39050.401 +18151 -0.040 9pg T. de Menten 39050.406 +18151 -0.035 11 A. Howell 39050.409 +18151 -0.032 10 T. de Menten 39052.795 +18153 -0.036 13 R. Monske 39056.379 +18156 -0.038 9pg T. de Menten 39056.381 +18156 -0.036 8 A. Howell 39075.501 +18172 -0.040 20 L. Robinson TV Cassiopeiae 39070.402 +10456 +0.010 10 T. de Menten 39079.472 +10461 +0.017 9 L. Robinson 39088.527 +10466 +0.009 10 L. Robinson AB Cassiopeiae 39067.633 +9936 +0.057 18 M. Baldwin XX Cephei 39080.6491 +5983 -0.073 13 M. Baldwin /1 TY Delphini 39052.542 +9262 -0.020 16 R. Monske AI Draconis 39057.418 +12028 +0.018 10 A. Howell SZ Herculis 39029.596 +2326 +0.010 11 R. Monske /2 SW Lacertae 39029.646 +48818.5 +0.032 12 R. Monske 39036.701 +48840.5 +0.031 12 R. Monske 39038.625 +48846.5 +0.031 14 T. Hering 39047.605 +48874.5 +0.031 13 R. Monske 39051.776 +48887.5 +0.032 13 R. Monske 39053.698 +48893.5 +0.030 12 R. Monske 39062.678 +48921.5 +0.030 13 R. Monske 39063.637 +48924.5 +0.027 13 R. Monske 39064.602 +48927.5 +0.030 13 R. Monske FL Lyrae 39051.433 +2385 +0.001 10 A. Howell 39053.606 +2386 -0.004 16 R. Monske Beta Lyrae /3 28325.39 -134 -0.01 14 J. Ashbrook 28855.51 - 93 +0.15 14 J. Ashbrook 29191.48 - 67 -0.04 12 J. Ashbrook 29656.65 - 31 -0.12 14 J. Ashbrook 29824.82 - 18 +0.01 14 J. Ashbrook 30703.70 + 50 -0.08 14 J. Ashbrook 31078.80 + 79 +0.17 13 J. Ashbrook 31311.39 + 97 +0.09 13 J. Ashbrook 31530.99 +114 -0.05 15 J. Ashbrook U Ophiuchi 35655.62 +16321 +0.009 16 J. Ashbrook V566 Ophiuchi /4 35658.467 +1008 +0.005 17 J. Ashbrook 35672.383 +1042 -0.007 13 J. Ashbrook 35689.597 +1084 +0.002 11 J. Ashbrook 35990.667 +1819 -0.014 16 J. Ashbrook 36012.810 +1873 +0.008 23 J. Ashbrook BV 544 Ophiuchi /5 38936.772 +19819.5 -0.014 9 D. Williams 38949.683 +19839 -0.001 9 D. Williams RT Persei 39051.750 +6903 -0.018 13 R. Monske Beta Persei /6 39046.674 +377 -0.007 18 R. Monske 39069.612 +385 -0.008 13 L. Robinson 39069.615 /7 +385 -0.005 9pe D. Engelkemeir 39089.689 +392 -0.002 11 L. Robinson 39092.552 +393 -0.007 12 J. Ashbrook 39092.553 +393 -0.006 11 L. Robinson RW Tauri 39077.762 +1681 +0.008 19 M. Baldwin X Trianguli 39057.679 +4490 +0.026 17 R. Swanberg 39059.623 +4492 +0.027 15 R. Monske 39092.649 +4526 +0.021 10 D. Williams 39095.567 +4529 +0.025 12 D. Williams 1). This is a revised determination by Baldwin, from more complete data, of a minimum published in IBVS No. 111. 2) O - C was computed from the elements given in Sky and Tele., 25, 5, 277. 3) These are normal minima, each formed by fitting a mean light curve to faint estimates. O - C' s were computed from elements derived by J. Ashbrook from these minima only: Min = JDhel 2430057.48 (+/-0.03) + 12.9260day (+/-0.0004) xE (mean errors). 4). These are normal minima formed with a mean light curve. O- C' s were computed from the elements of L. Binnendijk, AJ,64, 65, 1959. 5) O - C' s were computed from the elements given by Schoffel and Kohler in IBVS No .77. 6) O - C' s were computed from the elements given in Sky and Tele., 27, 5, 316. 7). The time of minimum was determined by fitting the observations to a normal light curve. This work is sponsored by the American Association of Variable Star Observers, with David B. Williams as program coordinator. The reductions are made by the writer with Joseph Ashbrook, except in a few cases which were checked. L. J. ROBINSON "Sky and Telescope" 49 Bay State Rd. Cambridge, Mass. 02138 USA