文章基本信息

标题：CCD PHOTOMETRIC STUDY AND PERIOD INVESTIGATION OF V508 OPH
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作者：Fu-Yuan Xiang ; Yun-Xia Yu ; Ting-Yu Xiao 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2015
卷号：149
期号：2
DOI：10.1088/0004-6256/149/2/62
语种：English
出版社：American Institute of Physics
摘要：In this paper, new CCD photometric observations of V508 Oph obtained in 2009 and 2010 at the Xinglong Observatory are presented. From the new observations, six new times of minimum light were derived. The light curves were analyzed by using the 2003 version of the Wilson–Devinney program. It is found that the asymmetric light curves can be modeled by a hot spot on the secondary component. The degree of overcontact is 15.4%, implying that the system is a shallow-contact binary. Combining the new times of minimum light with the photoelectric and CCD data compiled from the database, we investigate its orbital period. The results show that the orbital period may be undergoing multiple changes: a long-term decrease at a rate of days year−1, and a small periodic variation with a period of 24.27(±0.34) years. Since V508 Oph is an overcontact system and both components are late-type stars, we discuss the possible connection between the mass transfer, magnetic activity, the third body, and the orbital period changes.
关键词：binaries: eclipsing;binaries: general;stars: individual (V508 Oph)