COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS NUMBER 652 Konkoly Observatory Budapest 1972 April 5 A SEARCH FOR ECLIPSES OF HD 27149. HD 27149 (7.5m, G5) is a double-lined spectroscopic binary in the Hyades cluster. In the "Second Report of the Joint Working Group of I.A.U. Commissions 30 and 42" Batten and Wallerstein suggest a search for eclipses based on the ephemerides J.D. 2440916.56+75.665d E and 2440944.82+75.665d E. The binary was observed regularly during a photometric ubvy program of field stars. The observations were made with a simultaneous four-channel photometer attached to the Danish 50 cm reflector at the European Southern Observatory in Chile. The four-colour standard HR1373 (3.76m, K0III) was used as comparison star. The results are given in the table. The differences - HD 27149-HR 1373 - are given in the instrumental system, which is close to the standard system. Differential extinction corrections have been applied using mean extinction coefficients. No evidence of eclipses was found. However, any eclipse could easily have been overlooked, because the expected duration of a total eclipse for two solar-type stars with this period is only about 12 hours. Four-colour indices on the standard system will be published elsewhere. 1972, March 13 B.G. JORGENSEN and E.H. OLSEN Copenhagen University Observatory Brorfelde, Denmark. Delta u Delta v Delta b Delta y Notes 1971 Dec. 23.122d 2.863m 3.259m 3.623m 3.788m 1972 Jan. 4.099 2.842 3.246 3.612 3.777 5.090 2.839 3.245 3.614 3.776 6.087 2.841 3.247 3.617 3.773 6.150 2.848 3.248 3.619 3.779 7.085 2.843 3.251 3.605 3.777 8.085 2.857 3.243 3.608 3.779 1 9.076 2.840 3.232 3.606 3.769 11.066 2.861 3.255 3.614 3.780 1 12.067 2.863 3.257 3.621 3.783 1 13.064 2.854 3.231 3.600 3.766 15.048 2.834 3.237 3.611 3.779 17.044 2.837 3.241 3.607 3.776 19.041 2.812 3.214 3.584 3.754 1 20.044 2.827 3.230 3.600 3.772 21.054 2.859 3.248 3.616 3.781 1 22.047 2.858 3.253 3.620 3.788 1 23.055 2.848 3.243 3.609 3.772 24.051 2.834 3.234 3.601 3.773 25.045 2.832 3.245 3.615 3.774 1 26.047 2.858 3.273 3.645 3.810 1,2 27.039 2.850 3.247 3.625 3.787 28.040 2.821 3.231 3.606 3.779 29.040 2.825 3.225 3.602 3.761 30.031 2.837 3.240 3.610 3.777 Jan. 31.035 2.856 3.256 3.616 3.778 1 Feb. 1.038 2.857 3.253 3.621 3.786 2.042 2.845 3.243 3.605 3.771 3.049 2.844 3.228 3.595 3.760 1 4.031 2.826 3.230 3.605 3.770 1 5.035 2.867 3.244 3.610 3.780 1 6.031 2.856 3.249 3.615 3.778 1 7.031 2.837 3.238 3.608 3.782 1 8.031 2.864 3.238 3.608 3.774 1 10.029 2.848 3.236 3.605 3.761 1 12.031 2.854 3.244 3.608 3.769 13.035 2.839 3.239 3.611 3.776 14.038 2.832 3.234 3.610 3.776 16.024 2.840 3.239 3.604 3.781 17.031 2.846 3.245 3.615 3.797 18.026 2.855 3.250 3.618 3.787 19.032 2.856 3.254 3.622 3.788 1 20.025 2.866 3.245 3.610 3.784 21.024 2.853 3.243 3.609 3.776 22.026 2.853 3.245 3.610 3.776 2 23.018 2.838 3.229 3.604 3.761 1 24.024 2.848 3.238 3.601 3.775 24.063 2.859 3.246 3.616 3.787 25.027 2.863 3.255 3.619 3.785 26.026 2.853 3.239 3.605 3.774 27.024 2.843 3.242 3.605 3.771 28.022 2.840 3.238 3.600 3.766 Feb. 29.024 2.859 3.236 3.606 3.761 1 Mar. 1.025 2.846 3.235 3.604 3.774 mean 2.847m 3.242m 3.610m 3.777m scatter 0.012m 0.010m 0.009m 0.010m Notes: 1 Extinction larger than mean 2 About 8deg from the moon