Multiple frequency analysis of the large-amplitude SX Phoenicis star BL Camelopardalis

Abstract

A multifrequency analysis of the SX Phoenicis star BL Camelopardalis is presented on the basis of new high-speed photometry, along with fitting a total of 136 maxima. BL Cam is a multiple periodic pulsator. We find f0=25.5768, f1=25.2982, f2=25.8622, f3=31.5912, f4=25.1065, f5=25.5147 and f6=25.6188 cycle d−1 together with the harmonics 51.1513 and 76.7268 cycle d−1 and combination frequencies f0+f1, f0+f2 and f0+f3. The new frequency solution represents the light curves of BL Cam quite well. The observed minus calculated (O-C) analysis indicates that the fundamental frequency is in good agreement with the results of Fourier analysis.