Journal Article

New Photometric Investigation of the G-Type Contact Binary GSC 0763-0572

Wang Jing-Jing, Qian Sheng-Bang, Zhao Er-Gang, Zhu Li-Ying, Liao Wen-Ping, Li Kai, Zhang Jia, Liu Liang and Li Lin-Jia

in Publications of the Astronomical Society of Japan

Volume 64, issue 4 Published in print August 2012 | ISSN: 0004-6264
Published online August 2012 | e-ISSN: 2053-051X | DOI: https://dx.doi.org/10.1093/pasj/64.4.83

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We present new CCD photometric light curves of the W UMa-type binary system GSC 0763-0572 in the [math] , [math] , and [math] bands. Here, the light curves in the [math] and [math] bands are the first to be obtained. The primary component of this system belongs to a G-type solar-like star; our new observation indicates that the activities of GSC 0763-0572 may be stable. Based on all available times of the light minimum, we found that the orbital period is variable. The [math] [math] [math] curve suggested that the period of GSC 0763-0572 is undergoing a continuous increase at a rate of [math] [math] [math] 5.81(33) [math] 10[math] d yr[math] . Photometric solutions were derived by using the Wilson–Devinney code. We confirmed that this system is A-subtype overcontact binary with a degree of contact factor of [math] [math] 31.0% ([math] 1.5%), a mass ratio of [math] [math] 0.2330, and a temperature difference of [math] [math] 31 K. The long-term increase of the orbital period can be explained by mass transfer from the less-massive component to the more-massive one. It's inferred that GSC 0763-0572 may presently be in an expanding state of thermal relaxation oscillation, and may finally evolve into a rapid-rotating single star.

Keywords: binaries: close; binaries: eclipsing; stars: individual (GSC 0763-0572)

Journal Article.  3393 words.  Illustrated.

Subjects: Stars