IAU COMMISSION 27 UNPUBLISHED DATA FILE 100 4 pages, including cover sheet November, 1984 UBV OBSERVATIONS OF THE ECLIPSING BINARY SYSTEM SV TAURI Carlson R. Chambliss Kutztown State College Kutztown, PA USA 19530 SV Tauri was observed on three nights in December, 1981, with the 0.4 meter telescope no. 4 of Kitt Peak National Observatory. An RCA 1P21 photomultiplier, refrigerated with dry ice, was used. Each observation is the mean of at least two 10-second integrations on the pulse counting photo- meter. The comparison star used was BD +28 920. The colors and magnitudes obtained for this star were V = 8.99, B-V = -0.03, and U-B = -0.01. A total of 351 observations of SV Tauri was obtained. These obser- vations, corrected for light time and differential extinction, are listed on the following three pages. The magnitude differences are in the sense SV Tauri - BD +28 920. Phases for these observations can be obtained by use of the following ephemeris: JD Hel. 2434423.7491 + 2.1669051 E. +- 13 +- 3 p. e. This ephemeris was obtained by combining these data with earlier published times of minimum light. ***************************************************************************** COMMENT: OCR-ed - MIGHT CONTAIN ERRORS! ****************************************************************************** TABLE I OBSERVATIONS OF SV TAURI JD2444000+ DMAG V JD2444000+ DMAG B JD2444000+ DMAG 966.6363 0.692 966.6368 0.854 966.6373 0.717 .6386 0.696 .6391 0.843 .6397 0.715 .6415 0.692 .6420 0.841 .6426 0.720 .6437 0.701 .6443 0.847 .6449 0.729 .6511 0.711 .6517 0.861 .6523 0.739 .6532 0.711 .6537 0.855 .6543 0.737 .6550 0.714 .6556 0.851 .6562 0.733 .6570 0.712 .6575 0.858 .6581 0.739 .6590 0.719 .6596 0.858 .6603 0.735 .7046 0.688 .7053 0.863 .7058 0.761 .7063 0.699 .7067 0.855 .7073 0.739 967.6264 0.733 967.6269 0.881 967.6274 0.762 .6287 0.732 .6291 0.875 .6298 0.754 .6312 0.731 .6317 0.886 .6323 0.752 .6337 0.734 .6344 0.888 .6351 0.758 .6407 0.725 .6412 0.885 .6418 0.739 .6430 0.733 .6437 0.883 .6442 0.749 .6456 0.738 .6462 0.885 .6469 0.770 .6503 0.733 .6510 0.880 .6514 0.753 .6523 0.737 .6529 0.881 .6534 0.745 .6542 0.725 .6547 0.879 .6552 0.745 .6908 0.739 .6914 0.888 .6919 0.761 .6929 0.741 .6935 0.889 .6941 0.772 .6955 0.734 .6961 0.889 .6967 0.768 .6976 0.737 .6982 0.884 .6988 0.760 .7002 0.750 .7007 0.887 .7013 0.772 .7022 0.754 .7028 0.902 .7034 0.780 .7044 0.755 .7051 0.899 .7061 0.787 .7071 0.766 .7077 0.902 .7084 0.778 .7586 0.854 .7591 1.013 .7598 0.887 .7608 0.859 .7614 1.034 .7619 0.910 .7628 0.872 .7634 1.031 .7641 0.916 .7651 0.892 .7657 1.059 .7664 0.931 .7761 0.935 .7766 1.092 .7771 0.985 .7779 0.939 .7784 1.111 .7790 0.994 .7801 0.949 .7807 1.118 .7814 1.001 .7821 0.971 .7825 1.122 .7831 1.013 .7891 0.989 .7898 1.162 .7905 1.047 .7913 0.997 .7919 1.177 .7925 1.051 .7967 1.030 .7973 1.211 .7979 1.086 .7994 1.042 .8000 1.222 .8005 1.108 .8014 1.058 .8019 1.230 .8024 1.110 .8033 1.067 .8039 1.241 .8044 1.124 .8051 1.073 .8057 1.247 .8063 1.147 .8069 1.080 .8075 1.256 .8081 1.150 Page 2 TABLE I (cont.) OBSERVATIONS OF SV TAURI JD2444000+ DMAG V JD2444000+ DMAG B JD2444000+ DMAG U 967.8141 1.126 967.8146 1.310 967.8151 1.202 .8164 1.151 .8171 1.318 .8177 1.214 .8194 1.164 .8201 1.346 .8207 1.225 .8234 1.191 .8241 1.373 .8246 1.269 .8259 1.203 .8266 1.390 .8272 1.284 .8285 1.231 .8291 1.420 .8298 1.315 .8307 1.240 .8313 1.437 .8320 1.329 .8329 1.263 .8335 1.438 .8339 1.338 .8406 1.319 .8412 1.512 .8418 1.403 .8426 1.334 .8432 1.525 .8437 1.414 .8444 1.348 .8449 1.533 .8453 1.433 .8471 1.382 .8477 1.561 .8483 1.459 .8491 1.406 .8499 1.597 .8506 1.477 .8517 1.420 .8523 1.614 .8530 1.510 .8537 1.442 .8543 1.628 .8549 1.531 .8559 1.455 .8564 1.659 .8571 1.544 .8634 1.508 .8639 1.714 .8644 1.621 .8655 1.528 .8662 1.743 .8667 1.651 .8676 1.551 .8681 1.762 .8687 1.663 .8700 1.574 .8706 1.800 .8712 1.692 .8721 1.630 .8728 1.817 .8733 1.719 .8753 1.637 .8760 1.853 .8766 1.742 .8776 1.659 .8783 1.872 .8789 1.774 .8853 1.732 .8858 1.941 .8863 1.867 .8870 1.742 .8877 1.965 .8882 1.886 .8891 1.765 .8897 1.989 .8903 1.903 .8912 1.779 .8921 2.011 .8927 1.909 .8938 1.778 .8944 2.018 .8950 1.920 .8962 1.772 .8967 2.001 .8974 1.931 .8985 1.767 .8991 2.010 .8999 1.944 .9008 1.781 .9014 2.021 .9021 1.948 .9073 1.787 .9079 2.028 .9086 1.962 .9094 1.796 .9101 2.029 .9108 1.965 .9146 1.787 .9164 2.020 .9173 1.933 .9182 1.772 .9189 2.019 .9196 1.921 .9207 1.772 .9214 2.003 .9221 1.924 .9232 1.766 .9239 2.009 .9246 1.928 .9340 1.717 .9345 1.939 .9350 1.861 .9359 1.701 .9365 1.917 .9371 1.831 .9390 1.667 .9396 1.886 .9401 1.773 .9412 1.648 .9417 1.872 .9425 1.754 .9434 1.631 .9439 1.845 .9445 1.734 968.6050 0.687 968.6055 0.845 968.6060 0.729 .6067 0.696 .6073 0.854 .6078 0.728 .6088 0.703 .6093 0.847 .6098 0.727 .6104 0.700 .6111 0.848 .6118 0.719 .6133 0.706 .6138 0.850 .6143 0.730 Page 3 TABLE I (cont.) OBSERVATIONS OF SV TAURI JD2444000+ DMAG V JD2444000+ DMAG B JD2444000+ DMAG 968.6385 0.702 968.6390 0.861 968.6395 0.730 .6402 0.693 .6407 0.850 .6412 0.729 .6420 0.698 .6425 0.861 .6431 0.723 .6445 0.701 .6451 0.863 .6457 0.722 .6464 0.702 .6469 0.872 .6475 0.738 .6746 0.710 .6752 0.868 .6757 0.719 .6766 0.719 .6772 0.868 .6777 0.728 .6788 0.714 .6793 0.873 .6800 0.732 .6842 0.725 .6847 0.872 .6853 0.726 .6860 0.721 .6868 0.869 .6873 0.749 .7168 0.697 .7172 0.864 .7177 0.723 .7185 0.691 .7191 0.853 .7198 0.720 .7207 0.696 .7214 0.859 .7219 0.716 .7306 0.697 .7311 0.859 .7316 0.719 .7325 0.697 .7329 0.861 .7334 0.725 .7687 0.703 .7693 0.854 .7698 0.717 .7707 0.694 .7712 0.864 .7719 0.731 .7930 0.705 .7936 0.858 .7941 0.727 .7948 0.707 .7954 0.859 .7959 0.727 .7966 0.705 .7972 0.861 .7977 0.723 .8332 0.700 .8338 0.848 .8343 0.735 .8354 0.710 .8362 0.841 .8368 0.753 .8403 0.711 .8409 0.850 .8414 0.762 .8425 0.719 .8433 0.851 .8445 0.732 .8457 0.701 .8461 0.851 .8468 0.757