IAU COMMISSION 27 UNPUBLISHED DATA FILE 188 3 pages, including cover sheet February, 1986 PHOTOELECTRIC V MEASUREMENTS OF YY Gem = HD 60179C This file contains 298 photoelectric differential V measurements of YY Gem minus BD +31 1611, obtained with the double-beam photometer at the 106 cm Cassegrain telescope at Hoher List Observatory during four hours of flare monitoring on Nov. 12/13, 1984. Further details can be found in IBVS, 2819, 1985. E. H. Geyer and B. C. Kamper Observatorium Hoher List D-5568 Daun/Eifel F. R. Germany ************************************************************************************* #Comment: OCR-ed FROM PAPER SOURCE - MIGHT CONTAIN ERRORS! ************************************************************************************* Table I Differential V-magnitudes of YY Gem. BD +31 1611 served as a comparison star. J.D.hel. J.D.hel. J.D.hel. J.D.hel. 2446017+ Delta v 2446017+ Delta v 2446017+ Delta v 2446011+ Delta v 0.5020 -1.013 0.5304 -0.774 0.5566 -0.672 0.5818 -1.068 0.5024 -1.019 0.5309 -0.757 0.5570 -0.680 0.5823 -1.065 0.5029 -1.018 0.5314 -0.747 0.5575 -0.693 0.5827 -1.059 0.5033 -1.012 0.5318 -0.739 0.5582 -0.702 0.5832 -1.069 0.5038 -1.012 0.5323 -0.731 0.5587 -0.719 0.5841 -1.088 0.5043 -1.018 0.5346 -0.674 0.5591 -0.725 0.5846 -1.078 0.5047 -1.012 0.5351 -0.674 0.5596 -0.733 0.5851 -1.076 0.5066 -0.999 0.5355 -0.666 0.5601 -0.755 0.5855 -1.086 0.5070 -1.000 0.5360 -0.653 0.5605 -0.757 0.5860 -1.078 0.5075 -0.993 0.5364 -0.642 0.5610 -0.770 0.5864 -1.074 0.5080 -0.996 0.5369 -0.635 0.5614 -0.784 0.5869 -1.080 0.5084 -0.992 0.5374 -0.620 0.5619 -0.806 0.5874 -1.077 0.5089 -1.003 0.5378 -0.608 0.5624 -0.813 0.5878 -1.074 0.5094 -0.992 0.5383 -0.595 0.5628 -0.825 0.5883 -1.076 0.5098 -1.002 0.5388 -0.586 0.5631 -0.829 0.5888 -1.070 0.5103 -0.990 0.5392 -0.567 0.5645 -0.865 0.5892 -1.074 0.5126 -0.977 0.5397 -0.560 0.5649 -0.874 0.5897 -1.079 0.5131 -0.974 0.5401 -0.541 0.5654 -0.884 0.5901 -1.066 0.5135 -0.966 0.5406 -0.540 0.5658 -0.902 0.5922 -1.072 0.5140 -0.963 0.5413 -0.527 0.5663 -0.909 0.5927 -1.074 0.5145 -0.958 0.5418 -0.514 0.5668 -0.911 0.5929 -1.075 0.5149 -0.965 0.5422 -0.505 0.5672 -0.925 0.5932 -1.109 0.5154 -0.944 0.5427 -0.506 0.5677 -0.927 0.5934 -1.144 0.5158 -0.929 0.5432 -0.491 0.5682 -0.944 0.5936 -1.133 0.5163 -0.923 0.5436 -0.484 0.5686 -0.941 0.5941 -1.135 0.5168 -0.927 0.5441 -0.473 0.5691 -0.946 0.5945 -1.130 0.5172 -0.918 0.5445 -0.474 0.5695 -0.962 0.5950 -1.126 0.5184 -0.901 0.5450 -0.458 0.5700 -0.961 0.5955 -1.125 0.5189 -0.901 0.5455 -0.435 0.5705 -0.975 0.5959 -1.133 0.5193 -0.895 0.5459 -0.428 0.5707 -0.988 0.5964 -1.139 0.5198 -0.886 0.5464 -0.429 0.5714 -1.007 0.5969 -1.143 0.5202 -0.876 0.5489 -0.432 0.5719 -1.022 0.5973 -1.145 0.5207 -0.869 0.5494 -0.420 0.5723 -1.019 0.5978 -1.149 0.5233 -0.811 0.5499 -0.422 0.5728 -1.021 0.5987 -1.158 0.5237 -0.811 0.5503 -0.424 0.5733 -1.034 0.5992 -1.147 0.5242 -0.803 0.5508 -0.421 0.5737 -1.035 0.5996 -1.143 0.5246 -0.803 0.5513 -0.443 0.5742 -1.040 0.6001 -1.133 0.5251 -0.790 0.5517 -0.450 0.5746 -1.046 0.6006 -1.133 0.5256 -0.770 0.5522 -0.453 0.5751 -1.055 0.6010 -1.132 0.5260 -0.777 0.5526 -0.471 0.5756 -1.058 0.6015 -1.130 0.5267 -0.757 0.5531 -0.475 0.5772 -1.047 0.6020 -1.130 0.5272 -0.751 0.5536 -0.490 0.5776 -1.063 0.6024 -1.125 0.5276 -0.730 0.5540 -0.503 0.5781 -1.062 0.6029 -1.123 0.5279 -0.739 0.5545 -0.519 0.5786 -1.071 0.6033 -1.122 0.5281 -0.790 0.5547 -0.585 0.5790 -1.070 0.6038 -1.127 0.5283 -0.810 0.5550 -0.618 0.5795 -1.070 0.6043 -1.114 0.5286 -0.794 0.5552 -0.633 0.5800 -1.070 0.6047 -1.112 0.5290 -0.792 0.5554 -0.633 0.5804 -1.067 0.6066 -1.104 0.5295 -0.790 0.5557 -0.641 0.5809 -1.072 0.6070 -1.106 0.5300 -0.774 0.5561 -0.648 0.5814 -1.078 0.6075 -1.095 J.D.hel. J.D.hel. 2446017+ Delta v 2446017+ Delta v 0.6080 -1.107 0.6344 -1.091 0.6084 -1.108 0.6348 -1.091 0.6089 -1.106 0.6351 -1.100 0.6094 -1.104 0.6353 -1.118 0.6098 -1.113 0.6355 -1.172 0.6103 -1.120 0.6358 -1.206 0.6114 -1.102 0.6360 -1.202 0.6117 -1.083 0.6364 -1.202 0.6119 -1.101 0.6371 -1.201 0.6121 -1.139 0.6376 -1.221 0.6124 -1.143 0.6381 -1.246 0.6126 -1.147 0.6385 -1.245 0.6131 -1.152 0.6390 -1.237 0.6135 -1.142 0.6395 -1.241 0.6140 -1.149 0.6399 -1.235 0.6145 -1.141 0.6404 -1.230 0.6149 -1.143 0.6408 -1.230 0.6154 -1.149 0.6413 -1.220 0.6158 -1.146 0.6418 -1.222 0.6163 -1.148 0.6422 -1.213 0.6168 -1.157 0.6427 -1.211 0.6172 -1.157 0.6432 -1.207 0.6177 -1.154 0.6436 -1.204 0.6182 -1.159 0.6441 -1.198 0.6186 -1.165 0.6445 -1.192 0.6207 -1.167 0.6450 -1.200 0.6212 -1.168 0.6457 -1.187 0.6216 -1.162 0.6462 -1.187 0.6221 -1.161 0.6466 -1.175 0.6226 -1.163 0.6471 -1.171 0.6230 -1.167 0.6476 -1.176 0.6235 -1.165 0.6480 -1.168 0.6239 -1.157 0.6489 -1.157 0.6244 -1.161 0.6494 -1.155 0.6249 -1.163 0.6499 -1.148 0.6260 -1.145 0.6503 -1.147 0.6265 -1.147 0.6506 -1.145 0.6270 -1.143 0.6522 -1.134 0.6274 -1.148 0.6526 -1.132 0.6279 -1.147 0.6531 -1.119 0.6283 -1.140 0.6536 -1.118 0.6288 -1.141 0.6540 -1.128 0.6293 -1.137 0.6545 -1.121 0.6297 -1.131 0.6550 -1.120 0.6302 -1.132 0.6554 -1.122 0.6304 -1.128 0.6559 -1.128 0.6325 -1.090 0.6564 -1.111 0.6330 -1.098 0.6568 -1.118 0.6334 -1.090 0.6339 -1.091 Remarks Observing conditions: clear with some haze, bright moonlit sky, problems with stray light from Castor AB. A diaphragma of 14 arcsec diameter was used. Extinction coefficient kv = O.27m with fluctuations of +-O.02m. Expected overall accuracy of these observations is only a few hundredth mag, though the differential precision as judged from the light curve would be +-O.007m, approximately. This is due to uncertainties associated with the reduction process (variable background, drift corrections etc.). The magnitudes given in this file are derived from deflections averaged over time spans of 40 seconds, partly overlapping (in the vicinity of flare, i.e. their rising branches). Differential V-Magnitudes are given in the sense "YY Gem minus BD+31 1611". No differential extinction corrections have been applied; due to the proximity of the comparison star this was found unnecessary.