COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS Number 1559 Konkoly Observatory Budapest 1979 February 26 RECENT PHOTOMETRY OF WZ Sge During December 1978 we obtained photoelectric observations, mostly V, of WZ Sge using the Seyfert 60-cm telescope at the Dyer Observatory. The differential V and (B-V) observations, with respect to the Krzeminski and Kraft (1964) comparison star BD +17d4225, are listed in Tables I and II, respectively. They are in the sense, comparison minus variable. We estimate that the accuracy of our DeltaV and Delta(B-V) data is of the order of +-0.007m and +-0.012m, respectively. Most of our DeltaV data is shown in the figure, where the phases have been obtained from the epoch and period of Robinson, et al., (1978) and each night's results have been plotted separately. On those nights over which more than one cycle of the orbital period was observed the second cycle observations are shown as crosses. The light variations on individual nights do show some evidence for the small time scale flickering (2 to 10 minutes) noted by Patterson and McGraw (1978). We also call attention to the virtual doubling of the DeltaV amplitude over a two day period, from about 0.13m on HJD 2443855 to about 0.27m on HJD 2443857. A straight averaging of each night's (B-V) data indicate that the color index of WZ Sge becomes progressively redder as the recurrent nova decreases in brightness. A.M. HEISER and G.W. HENRY Dyer Observatory Vanderbilt University Nashville, Tennessee 37235, U.S.A. References: Krzeminski, W. and Kraft, R.P. 1964, Ap.J. 140, 921 [BIBCODE 1964ApJ...140..921K ] Patterson, J. and McGraw, J.T., 1978, I.A.U. Circular No. 3311 [BIBCODE 1978IAUC.3311....1P ] Robinson, E.L., Nather, R.E., and Patterson, J. 1978, Ap.J. 219, 168 [BIBCODE 1978ApJ...219..168R ] Table I Differential V Data for WZ Sge ------------------------------------------------------------- Hel. J.D. DeltaV Hel. J.D. DeltaV Hel. J.D. DeltaV ------------------------------------------------------------- 48.4837 -0.142 55.4848 -0.931 55.5384 -0.978 48.4875 -0.147 55.4858 -0.934 55.5394 -0.981 48.4902 -0.122 55.4877 -0.922 55.5405 -0.976 48.4994 -0.007 55.4885 -0.916 55.5414 -0.983 48.5022 +0.048 55.4895 -0.892 55.5423 -0.975 48.5047 +0.014 55.4905 -0.896 57.4848 -0.871 48.5178 -0.167 55.4913 -0.907 57.4861 -0.871 48.5204 -0.197 55.4970 -0.847 57.4873 -0.891 48.5286 -0.204 55.4980 -0.852 57.4885 -0.903 48.5312 -0.159 55.4990 -0.856 57.4897 -0.937 48.5337 -0.170 55.4999 -0.858 57.4921 -0.962 48.5423 -0.183 55.5009 -0.879 57.4931 -0.982 48.5444 -0.170 55.5030 -0.880 57.4942 -1.003 48.5468 -0.148 55.5039 -0.877 57.4954 -1.000 52.5025 -0.655 55.5049 -0.895 57.5007 -1.058 52.5040 -0.672 55.5059 -0.913 57.5019 -1.088 52.5065 -0.703 55.5070 -0.917 57.5029 -1.084 52.5077 -0.691 55.5131 -0.922 57.5039 -1.079 52.5103 -0.681 55.5141 -0.939 57.5050 -1.087 52.5115 -0.682 55.5152 -0.958 57.5059 -1.099 52.5165 -0.640 55.5161 -0.962 57.5081 -1.085 52.5178 -0.623 55.5171 -0.969 57.5090 -1.080 52.5203 -0.559 55.5193 -0.948 57.5102 -1.085 52.5215 -0.596 55.5205 -0.954 57.5113 -1.071 52.5240 -0.582 55.5215 -0.923 57.5124 -1.069 52.5251 -0.566 55.5226 -0.918 57.5134 -1.054 52.5301 -0.553 55.5237 -0.910 57.5191 -1.057 52.5313 -0.584 55.5246 -0.911 57.5201 -1.074 52.5335 -0.604 55.5302 -0.890 57.5211 -1.085 52.5348 -0.595 55.5313 -0.916 57.5222 -1.085 52.5373 -0.638 55.5323 -0.925 57.5233 -1.038 52.5385 -0.625 55.5333 -0.940 57.5247 -1.040 55.4819 -0.963 55.5342 -0.946 57.5268 -1.046 55.4827 -0.943 55.5363 -0.914 57.5278 -0.978 55.4837 -0.931 55.5375 -0.941 57.5289 -0.929 57.5299 -0.918 65.4904 -1.589 68.4871 -1.776 57.5309 -0.895 65.4915 -1.577 68.4902 -1.781 57.5319 -0.896 65.4927 -1.590 68.4917 -1.786 57.5373 -0.811 65.4974 -1.626 68.4931 -1.783 57.5382 -0.821 65.4986 -1.628 68.4983 -1.798 57.5392 -0.828 65.4998 -1.644 68.4994 -1.823 57.5405 -0.836 65.5025 -1.655 68.5008 -1.824 57.5416 -0.821 65.5038 -1.659 68.5034 -1.829 57.5425 -0.823 65.5050 -1.644 68.5045 -1.822 58.5447 -0.870 65.5100 -1.647 68.5057 -1.819 57.5458 -0.880 65.5112 -1.661 68.5103 -1.806 57.5467 -0.899 65.5124 -1.671 68.5114 -1.776 57.5478 -0.927 65.5148 -1.670 68.5125 -1.777 57.5489 -0.936 65.5160 -1.661 68.5147 -1.744 57.5500 -0.961 65.5172 -1.649 68.5157 -1.746 57.5551 -1.027 65.5219 -1.634 68.5157 -1.750 57.5563 -1.039 65.5232 -1.643 68.5208 -1.762 57.5574 -1.049 65.5244 -1.637 68.5218 -1.727 57.5584 -1.053 65.5269 -1.692 68.5229 -1.725 57.5594 -1.051 65.5282 -1.682 68.5239 -1.699 57.5605 -1.049 65.5294 -1.694 68.5249 -1.677 57.5615 -1.043 65.5343 -1.629 69.4874 -1.881 57.5625 -1.074 65.5356 -1.607 69.4889 -1.874 57.5634 -1.071 65.5369 -1.591 69.4904 -1.873 57.5644 -1.080 65.5398 -1.550 69.4932 -1.826 64.4821 -1.622 65,5409 -1.530 69.4942 -1.831 64.4830 -1.623 65.5420 -1.561 69.4953 -1.825 64.4853 -1.656 65.5431 -1.543 69.4992 -1.872 65.4856 -1.603 65.5443 -1.585 69.5002 -1.885 65.4869 -1.600 68.4842 -1.766 69.5001 -1.871 65.4880 -1.578 68.4857 -1.766 ---------------------------------------------------------------- Table II Differential (B-V) Data for WZ Sge ------------------------------------------------------------ Hel.J.D. Delta(B-V) Hel.J.D. Delta(B-V) ------------------------------------------------------------ 48.4855 +0.286 55.5020 +0.143 48.4887 +0.241 55.5182 +0.156 48.5007 +0.200 55.5352 +0.151 48.5047 +0.243 57.4909 +0.191 48.5193 +0.210 57.5069 +0.145 48.5299 +0.166 57.5258 +0.127 48.5324 +0.221 57.5436 +0.057 48.5433 +0.200 64.4840 +0.117 48.5457 +0.257 65.4893 +0.120 52.5053 +0.230 65.5011 +0.114 52.5089 +0.227 65.5136 +0.120 52.5190 +0.208 65.5256 +0.142 52.5229 +0.182 68.4887 +0.102 52.5324 +0.172 68.5022 +0.087 52.5361 +0.193 68.5136 +0.070 55.4867 +0.114 69.4920 +0.086 ------------------------------------------------------------ [FIGURE 1]