Time-Series Ensemble Photometry of SX Phoenicis Stars. I. BL Camelopardalis

Details Time-Series Ensemble Photometry of SX Phoenicis Stars. I. BL Camelopardalis Time-Series Ensemble Photometry of SX Phoenicis Stars. I. BL Camelopardalis

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997pasp..109...15h&link_type=abstract

Publications of the Astronomical Society of the Pacific, v.109, p.15-20

Astronomy and Astrophysics

Astronomy

28

Stars: Individual: Gd 428

Scientific paper

We present an analysis of the multiperiodic SX Phoenicis star BL Camelopardalis (GD 428). Along with 24 times of maximum light from archival data, six previously unpublished times of maximum light from photomultiplier observations and 39 new CCD observations of maximum light are reported. The new CCD observations indicate that BL Cam is a double-mode variable with a primary period of 0.0391 day, a secondary period of 0.0306 day, and a $\pi1$/ $\pi0$ ratio of 0.783. The relation between metallicity and period ratio for large amplitude $\delta$ Scuti variables is examined in detail. Finally, evidence is presented that the fundamental period $\pi0$ has increased by 0.009 seconds in the last 20 years. (SECTION: Stars)

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