Variability Study of the SX Phoenicis Star BL Camelopardalis |
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Authors: | Jian-Ning Fu Chao Zhang Kanokwan Marak Chayan Boonyarak Pongsak Khokhuntod Shi-Yang Jiang |
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Institution: | [1]Department of Astronomy, Beijing Normal University, Beijing 100875 [2]Faculty of Science, Naresuan University, Phitsanulok 65000, Thailand [3]National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 |
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Abstract: | New time-series photometric observations of BL Cam in the V band and white light were made during 2005 to 2007 at the Xinglong Station of China. The frequency analysis confirms two closely separated frequencies, 25.181 d-1 and 25.571 d-1, but the frequency of 31-32 d-1 reported in the literature was not detected in the new data. New times of maximum light were determined from both our light curves and those available on Internet, allowing a more comprehensive study of the O - C diagram, together with the times of maximum light in the literature. A new interpretation, including the period increasing before 1988 and decreasing since 1992 of BL Cam and the light-time effect in a binary system, looks plausible. |
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Keywords: | techniques: photometric - stars: variables: delta Scuti - stars: individual: BL Cam |
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