Photometric properties of the delta Scuti star BR Cancri

We present the results of a three-year Johnson V and Stromgren uvbyH beta p hotometric study of the delta Scuti star BR Cancri (BR Cnc). Our data sets consist of 1293 discrete differential magnitudes in Johnson V and yellow y filters, 883 in Stromgren and 239 in ub filters. The Fourier analysis of th e data suggests four pulsation frequencies for the variable: f(1) = 24.978, f(2) = 11.358, f(3) = 11.808 and f(4) = 27.914 cycle d(-1). During the thr ee observing years, the main frequency f(1) kept its V(y) amplitude constan t at about 6mmag but its v amplitude seems to be changing. Amplitude variat ions for all the three other frequencies are also claimed. The pulsation mo des of the frequencies are discussed based on the colour data. Using uvby b eta data and calibrations in the literature, we derive the physical paramet ers for BR Cnc.