Multifrequency Modulation of the SX Phe Star BL Cam

Details Multifrequency Modulation of the SX Phe Star BL Cam Multifrequency Modulation of the SX Phe Star BL Cam

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998dssn...12...30z&link_type=abstract

Delta Scuti Star Newsletter, Issue 12, p. 30-33.

Physics

Scientific paper

The multifrequency analysis of the SX Phoenicis star BL Camelopardalis is presented on the basis of new high-speed photometry, along with the fitting of a total of 136 times of maximum light available up to date. Results show that BL Cam is a multi-periodic pulsator. BL Cam pulsates in four modes with a harmonic 2f=51.1513 c/d and 3f=76.7268 c/d, as well as combination frequency terms. The new frequency solution f0=25.5768 c/d, f1=25.2761 c/d, f2=25.9393 c/d and f3=31.5909 c/d features the light curves of BL Cam quite well. f1 and f2 could be nonradial modes. The period ratio of 0.810 between the first overtone and the fundamental mode locates BL Cam at a more advanced evolutionary status with much lower metal abundance. The O-C analysis indicates that the fundamental frequency is in good agreement with the results of Fourier analysis. The O-C values further suggest that the fundamental frequency is increasing slowly at a rate of 7.14 times 10^-13 days/cycle.

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