W UMa-type stars BV Dra conis and BW DRa conis: Photoelectric observations

Photoelectric UBV observations of two W UMa-type stars, BV Dra (ADS 9537A) and BW Dra (ADS 9537B), are presented. New periods and epochs of minima are given for both variables, and magnitudes at maximum light are determined from standard star observations. It is concluded that these variables are quite normal W UMa stars.The two variables are members of the visual binary star ADS 9537, for which the angular separation and the position angle are determined from the photographic observations.On leave of absence from Dept. of Earth Science and Astronomy, College of General Education University of Tokyo.