COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS NUMBER 373 Konkoly Observatory Budapest 1969 August 30 1969 UBV OBSERVATIONS OF CG CYGNI UBV photoelectric data, in the form of dual 10-second integrations in each filterband, of the eclipsing binary CG Cygni were taken during June 1969 at the Kitt Peak National Observatory using a 19" reflector. The observations are part of a continuing program, begun in 1965, the purpose of which is to study the asymmetries in the light curve maxima of close binaries. The data consist of differential values between the variable star and BD +34deg4216. Phases were computed using the light elements E = 2422967.4283 and p^-1 = 1.5844252^d-1 Julian Date Cycle Phase DV D(B-V) D(U-B) 2440300+ 27500+ 78.9286 87.2205 1.129 0.137 0.152 78.9310 87.2241 1.095 0.179 0.141 79.8932 88.7488 1.100 0.144 0.113 79.8957 88.7524 1.120 0.103 0.101 79.9040 88.7656 1.109 0.110 0.134 79.9063 88.7695 1.097 0.125 0.122 79.9406 88.8237 1.133 0.100 0.146 79.9432 88.8279 1.122 0.111 0.157 79.9467 88.8335 1.131 0.125 0.123 79.9486 88.8364 1.116 0.129 0.118 79.9527 88.8430 1.121 0.132 0.141 80.9343 90.3984 1.063 0.121 0.087 80.9362 90.4016 1.066 0.122 0.119 80.9378 90.4043 1.059 0.115 0.094 80.9396 90.4070 1.072 0.106 0.126 80.9422 90.4111 1.096 0.098 0.091 80.9438 90.4136 1.088 0.111 0.101 80.9447 90.4150 1.100 0.099 0.106 80.9457 90.4167 1.106 0.098 0.096 80.9476 90.4197 1.103 0.101 0.127 80.9508 90.4248 1.122 0.088 0.118 80.9525 90.4275 1.125 0.087 0.109 80.9535 90.4290 1.119 0.097 0.125 80.9555 90.4321 1.126 0.095 0.105 80.9578 90.4360 1.152 0.091 0.087 80.9594 90.4382 1.170 0.077 0.093 81.9007 91.9299 1.256 0.179 0.145 81.9017 91.9314 1.277 0.166 0.156 81.9025 91.9326 1.292 0.172 0.136 81.9034 91.9341 1.297 0.184 0.141 81.9044 91.9358 1.318 0.180 0.194 81.9057 91.9377 1.354 0.167 0.190 81.9067 91.9392 1.359 0.178 0.179 81.9076 91.9407 1.389 0.176 0.180 81.9087 91.9424 1.420 0.173 0.191 81.9119 91.9478 1.490 0.185 0.203 81.9130 91.9492 1.500 0.195 0.198 81.9138 91.9504 1.551 0.170 0.272 81.9147 91.9519 1.534 0.204 0.225 81.9156 91.9536 1.570 0.199 0.236 81.9173 91.9563 1.605 0.188 0.258 81.9182 91.9578 1.620 0.188 0.300 81.9192 91.9596 1.629 0.222 0.238 81.9201 91.9604 1.639 0.217 0.301 81.9234 91.9658 1.729 0.229 0.289 81.9244 91.9675 1.750 0.229 0.290 81.9257 91.9692 1.765 0.252 0.318 81.9268 91.9712 1.790 0.241 0.293 81.9285 91.9741 1.796 0.259 0.291 81.9295 91.9756 1.802 0.253 0.315 81.9306 91.9771 1.808 0.236 0.328 81.9314 91.9783 1.787 0.266 0.334 81.9334 91.9817 1.805 0.229 0.331 81.9344 91.9834 1.795 0.227 0.307 81.9353 91.9849 1.786 0.227 0.303 81.9363 91.9863 1.756 0.235 0.321 81.9373 91.9880 1.722 0.234 0.312 81.9383 91.9895 1.727 0.219 0.297 81.9429 91.9968 1.638 0.184 0.295 81.9440 91.9983 1.587 0.207 0.271 81.9459 92.0015 1.545 0.215 0.270 82.8379 93.4148 1.103 0.113 0.079 82.8403 93.4185 1.101 0.110 0.092 83.8086 94.9526 1.568 0.192 0.212 83.8103 94.9556 1.613 0.195 0.208 83.8136 94.9607 1.686 0.187 0.274 83.8153 94.9634 1.729 0.198 0.247 83.8159 94.9641 1.739 83.8162 94.9646 1.729 83.8164 94.9653 1.751 83.8167 94.9656 1.741 83.8170 94.9661 1.757 83.8173 94.9666 1.767 83.8175 94.9668 1.762 83.8178 94.9673 1.764 83.8180 94.9675 1.779 83.8183 94.9680 1.779 83.8186 94.9685 1.790 83.8194 94.9700 1.807 0.225 0.310 83.8222 94.9741 1.834 0.210 0.338 83.8232 94.9758 1.847 0.207 0.354 83.8238 94.9768 1.838 83.8241 94.9773 1.843 83.8244 94.9778 1.825 83.8246 94.9780 1.850 83.8251 94.9788 1.836 0.233 0.316 83.8262 94.9805 1.832 0.212 0.319 83.8278 94.9832 1.825 0.239 0.294 83.8309 94.9880 1.771 0.194 0.316 83.8321 94.9900 1.734 0.203 0.274 83.8335 94.9924 1.697 0.207 0.278 83.8343 94.9937 1.691 0.189 0.283 83.8379 94.9993 1.600 0.204 0.276 83.8400 95.0024 1.571 0.205 0.241 83.8411 95.0044 1.547 0.189 0.251 83.8450 95.0105 1.474 0.169 0.217 83.8469 95.0132 1.455 0.147 0.218 83.8478 95.0149 1.406 0.167 0.234 83.8494 95.0171 1.397 0.160 0.200 83.8991 95.0959 1.099 0.130 0.162 83.9009 95.0991 1.106 0.142 0.147 83.9021 95.1011 1.101 0.132 0.141 83.9037 95.1035 1.107 0.129 0.143 83.9103 95.1138 1.089 0.169 0.113 83.9114 95.1155 1.095 0.124 0.163 83.9132 95.1184 1.091 0.119 0.142 83.0146 95.1208 1.097 0.139 0.136 83.9355 95.1536 1.100 0.112 0.137 83.9370 95.1560 1.097 0.120 0.129 83.9385 95.1587 1.090 0.117 0.147 83.9396 95.1602 1.082 0.125 0.129 83.9435 95.1665 1.083 0.133 0.129 83.9446 95.1680 1.083 0.122 0.151 83.9462 95.1707 1.078 0.126 0.150 83.9473 95.1726 1.083 0.125 0.142 84.8726 96.6387 1.102 0.105 0.121 84.8742 96.6414 1.098 0.109 0.115 84.8771 96.6460 1.090 0.121 0.098 84.8785 96.6484 1.080 0.116 0.109 84.8800 96.6506 1.100 0.106 0.108 84.8826 96.6550 1.105 0.101 0.114 84.8837 96.6565 1.095 0.116 0.111 84.8855 96.6597 1.095 0.111 0.136 84.8867 96.6616 1.111 0.096 0.129 84.8937 96.6724 1.099 0.116 0.123 84.8976 96.6785 1.104 0.104 0.118 84.8987 96.6804 1.092 0.117 0.120 84.9003 96.6829 1.095 0.119 0.127 84.9015 96.6848 1.088 0.122 0.124 84.9241 96.7207 1.102 0.111 0.140 84.9260 96.7234 1.114 0.109 0.133 84.9294 96.7288 1.116 0.094 0.121 84.9311 96.7314 1.105 0.112 0.127 The light curve has apparently undergone a greater change between June 1967 and June 1969 than it had between October 1965 and June 1967, the maxima now appearing nearly equal. Reference: Milone, E. F. 1969, I. A. U. Colloquium on Non- Periodic Phenomena in Variable Stars. p. 457 [BIBCODE 1969CoKon..65..457M ] [CoKon No. 65] E. F. MILONE Gettysburg College, Kitt Peak National Observatory and The University of Maryland