IAU COMMISSION 27 UNPUBLISHED DATA FILE 125 4 pages, including cover sheet August, 1983 B PHOTOMETRY OF 6 EARLY B STARS Six early B stars suspected of short period variability on timescales of about a day or less were investigated photometrically in September 1982 at the University of Toronto. Observations were made in the B band with the Department of Astronomy 0.4 m telescope relative to nearby comparison stars. The observations and the method of reduction are to be described in an IAU Information Bulletin (Stagg, 1983, submitted for publication). Of the six stars variability was confirmed in three cases: V358 Per, 2 Vul, and V819 Cyg. In no case could a convincing fit be made to previous periods. In addition, two of the check stars, HD 13970 and HR 7577, were observed to have relatively large amplitude, short timescale variations. A list of the stars observed: Name HR HD Name HR HD V 1 Cam 1417 28446 V V568 Cyg 7927 197419 C1 2 Cam 1466 29316 C1 HD196121 -- 196120 C2 HR1314 1314 26764 C2 HD195102 -- 195102 V HR8105 8105 201819 V 2(ES)Vul 7318 180968 C1 HD202126 -- 202126 C1 HD181751 -- 181751 C2 HR8120 8120 202240 C2 1 Vul 7306 180554 V V358 Per -- 13890 V V819 Cyg 7600 188439 C1 HD13831 -- 13831 C1 HR7591 7591 188252 C2 HD13970 -- 13970 C2 HR7577 7577 188074 CHRISTOPHER STAGG Department of Astronomy University of Toronto Toronto, Canada M5S 1A7 ************************************************************************************ #Comment: OCR-ED FROM PAPER SOURCE - MIGHT CONTAIN ERRORS! ************************************************************************************ NOTE: Sigma is the error due to scatter in the DC ammeter readings only. 1 Cam AB - 2 Cam HR1314 - 2 Cam Heliocentric J.D. B sigma B sigma 2 445 216.774 -0.075 0.013 -0.408 0.010 17.794 -0.070 0.012 -0.416 0.011 17.860 -0.073 0.012 -0.406 0.007 HR8105 - HD202126 HR8120 - HD202126 Heliocentric J.D. B sigma B sigma 2 445 216.627 -0.489 0.007 -0.566 0.007 16.696 -0.489 0.007 -0.558 0.009 16.750 -0.496 0.012 -0.556 0.011 17.602 -0.481 0.008 -0.562 0.007 17.660 -0.478 0.009 -0.566 0.010 17.712 -0.478 0.012 -0.560 0.009 17.759 -0.482 0.013 -0.563 0.010 17.845 -0.473 0.017 -0.558 0.016 21.613 -0.484 0.005 -0.560 0.011 21.651 -0.479 0.007 -0.554 0.008 21.688 -0.475 0.007 -0.549 0.008 21.718 -0.474 0.008 -0.558 0.008 V358 Per - HD13831 HD13970 - HD13831 Heliocentric J.D. B sigma B sigma 2 445 216.634 0.279 0.022 0.108 0.021 16.703 0.293 0.016 0.100 0.012 16.758 0.264 0.024 0.077 0.012 17.609 0.283 0.013 0.095 0.010 17.670 0.290 0.019 0.110 0.016 17.720 0.307 0.020 0.112 0.017 17.786 0.310 0.013 0.110 0.019 21.618 0.330 0.021 0.146 0.023 21.691 0.338 0.022 0.125 0.015 21.722 0.311 0.016 0.096 0.018 V568 Cygni - HD196120 HD195102 - HD 196120 Heliocentric J.D. B sigma B sigma 2 445 216.617 -0.075 0.006 0.344 0.008 16.685 -0.070 0.009 0.343 0.013 16.739 -0.064 0.010 0.340 0.010 17.590 -0.064 0.007 0.338 0.011 17.637 -0.066 0.009 0.352 0.011 17.703 -0.070 0.009 0.350 0.010 17.751 -0.064 0.012 0.344 0.015 18.587 -0.064 0.008 0.340 0.011 21.607 -0.064 0.005 0.345 0.007 21.645 -0.055 0.011 0.357 0.010 21.681 -0.054 0.008 0.367 0.011 21.712 -0.061 0.007 0.358 0.008 2 Vul - HD181751 1 Vul - HD181751 Heliocentric J.D. B sigma B sigma 2 445 216.601 -0.898 0.016 -1.626 0.016 16.667 -0.898 0.023 -1.627 0.024 16.728 -0.889 0.024 -1.615 0.023 17.579 -0.889 0.016 -1.625 0.017 17.627 -0.906 0.020 -1.637 0.021 17.693 -0.926 0.014 -1.637 0.014 21.600 -0.919 0.012 -1.630 0.014 21.638 -0.920 0.012 -1.629 0.014 21.675 -0.928 0.014 -1.635 0.013 V819 Cygni - HR7591 HR7577 - HR7591 Heliocentric J.D. B sigma B sigma 2 445 215.561 0.423 0.013 0.867 0.014 16.587 0.459 0.004 0.874 0.005 16.656 0.457 0.006 0.866 0.011 16.717 0.454 0.007 0.866 0.010 16.806 0.451 0.016 0.837 0.012 17.570 0.448 0.006 0.868 0.007 17.617 0.443 0.006 0.859 0.007 17.683 0.436 0.005 0.859 0.007 17.731 0.437 0.010 0.858 0.012 17.808 0.430 0.018 0.825 0.015 18.587* 0.445 0.009 0.873 0.027 21.594 0.445 0.006 0.856 0.010 21.632 0.459 0.007 0.858 0.008 21.669 0.458 0.006 0.839 0.006 21.699 0.453 0.007 0.847 0.008 *Average of two measurements.