COMMISSION 27 OF THE I. A. U INFORMATION BULLETIN ON VARIABLE STARS NUMBER 221 Konkoly Observatory Budapest 18 August 1967 MINIMA OF ECLIPSING VARIABLES - 7 This report continues the one in IBVS No. 180, and contains 85 observed minima of 30 eclipsing variable stars. All are visual timings reduced by the tracing-paper method, except where noted. Linear elements in the 1958 General Catalogue of Variable Stars were used to compute the 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 Anromedae 39445.668 +24,369 -0.024 8 M. Baldwin 39464.551 +24,399 -0.009 14 F. Sanner 39474.597 +24,415 -0.026 16 M. Baldwin 39520.514 +24,488 -0.021 12 R. Monske WZ Andromedae 39355.753 +19,316 +0.009 17 L. Hazel XZ Andromedae 39421.636 +4,817 +0.058 13 L. Hazel 39474.570 +4,856 +0.058 16 M. Baldwin 39482.714 +4,862 +0.059 31 R. Swanberg 39497.642 *4,873 +0.057 26 R. Swanberg 39501.716 +4,876 +0.059 27 R. Swanberg 39554.650 +4,915 +0.059 24 R. Swanberg WW Aurigae 39477.768 +2,461 +0.005 12 M. Baldwin Y Camelopardalis 39477.815 +4,551 -0.011 15 M. Baldwin SV Camelopardalis 39440.663 +12,061 -0.023 12 M. Baldwin 39443.637 +12,066 -0.015 14 M. Baldwin 39463.811: +12,100 -0.005 14 D. Loring 39468.544 +12,108 -0.017 16 F. Sanner 39548.605 +12,243 -0.021 24 F. Chapman 39562.836 +12,267 -0.023 12 D. Loring 39565.801 +12,272 -0.024 13 D. Loring 39568.769 +12,277 -0.021 16 F. Sanner 39580.629 +12,297 -0.023 13 F. Sanner 39612.651 +12,351 -0.027 15 F. Chapman WW Cancri 39443.879 +10,721 -0.036 19 L. Hazel AK Canis Minoris 39520.713 +25,037 +0.043 22 L. Hazel RZ Cassiopeiae 39443.643 +18,480 -0.035 19 M. Baldwin 39449.618 +18,485 -0.037 14 M. Baldwin 39461.578 +18,495 -0.029 20 L. Hazel 39468.745 +18,501 -0.034 23 L. Hazel 39468.738: +18,501 -0.041 13 R. Swanberg 39474.720 +18,506 -0.035 14 R. Swanberg 39492.647 +18,521 -0.037 22 M. Baldwin 39511.7690 +18,537 -0.0388 69pe A. Stokes 39559.574 +18,577 -0.044 14 R. Monske 39559.578 +18,577 -0.040 22 D. Lucas TV Cassiopeiae 39445.592 +10,663 -0.011 15 R. Monske AB Cassiopeiae 39440.792 +10,209 +0.062 26 M. Baldwin 39473.599 +10,233 +0.064 16 M. Baldwin 39477.703 +10,236 +0.068 27 M. Baldwin 39492.732 +10,247 +0.061 29 M. Baldwin U Cephei 39440.789 +12,656 +0.778 28 M. Baldwin 39495.633 +12,678 +0.779 22 M. Baldwin 39500.624 +12,680 +0.784 25 M. Baldwin 39505.605 +12,682 +0.779 19 M. Baldwin Z Draconis 39606.596: +4,669 +0.012 16 D. Livingston 39610.665: +4,672 +0.009 32 D. Livingston SZ Herculis ^1 39361.745: +2,732 +0.014 18 R. Swanberg 39608.805 +3,034 +0.009 24 L. Hazel 39613.717 +3,040 +0.012 10 T. Cragg UX Herculis 39591.844 +12,729 -0.026 19 L. Hazel SW Lacertae 39451.565 +50,134 +0.050 13 R. Monske 39468.716 +50,187.5 +0.043 15 R. Swanberg 39469.678 +50,190.5 +0.043 18 F. Chapman T Leonis Minoris 39529.709 +5,190 -0.069 24 L. Hazel Y Leonis 39531.727 +3,465 +0.036 24 L. Hazel 39536.789 +3,468 +0.040 24 L. Hazel 39548.590 +3,475 +0.038 18 R. Monske 39558.704 +3,481 +0.036 27 M. Baldwin 39558.705 +3,481 +0.037 20 L. Hazel 39580.621 +3,494 +0.034 17 R. Monske 39580.624 +3,494 +0.037 20 L. Hazel 39585.683 +3,497 +0.038 20 F. Chapman 39590.745 +3,500 +0.041 17 T. Cragg FL Orionis 39442.909 +4,870 +0.062 9 M. Baldwin 39495.640 +4,904 +0.060 21 M. Baldwin RT Persei 39440.776 +7,361 -0.018 18 M. Baldwin 39526.568 +7,462 -0.016 11 M. Baldwin XZ Persei 39445.662 +12,413 +0.003 20 M. Baldwin Beta Persei ^2 39459.565 +521 -0.012 8 J. Olivarez 39525.523 +544 -0.002 15 L. Hazel BV 312 Tauri ^3 39492.501 +6,736 -0.001 23 A. Howell Insert RW Tau from p. 5 X Trianguli 39468.635: +4,913 +0.026 23 L. Hazel 39471.555 +4,916 +0.031 12 C. Ricker W Ursae Majoris 39549.736 +15,167 +0.009 8 T. Cragg 39553.742 +15,179 +0.011 9 T. Cragg 49556.743 +15,188 +0.009 6 T. Cragg 39557.748 +15,191 +0.013 13 T. Cragg 39590.771 +15,290 +0.006 9 T. Cragg 39597.791 +15,311 +0.020 10 T. Cragg TX Ursae Majoris 39603.798 +7,566 -0.045 13 S. Cook XZ Ursae Majoris 39521.609 +10,747 +0.056 19 L. Hazel AW Vulpeculae 39443.533 +16,037 -0.013 12 R. Monske BU Vulpeculae 39445.515 +10,277 +0.042 17 R. Monske 39449.503 +10,284 +0.047 16 R. Monske RW Tauri 39473.703 +1,824 +0.007 22 M. Baldwin This work is sponsored by the American Association of Variable Star Observers, with David B. Williams as program coordinator. The reductions were made by the writer with Joseph Ashbrook, except in some cases which were checked. L.J. ROBINSON "Sky and Telescope" 49 Bay State Rd. Cambridge, Mass. USA 1). O-C's computed from elements in Sky and Tele., 25, 5, 277. 2). O-C's computed from elements in Sky and Tele., 27, 5, 316. 3). O-C's computed from elements in Sky and Tele., 26, 5, 264.