A photometric study of the neglected eclipsing binary BS Cassiopeiae

	A photometric study of the neglected eclipsing binary BS Cassiopeiae
	Yang, YG1,2 ; Wei, JY 1; He JJ(何家佳)3
刊名	ASTRONOMICAL JOURNAL
	2008-08
卷号	136 期号:2 页码:594-601
关键词	binaries : close binaries : eclipsing stars : individual (BS Cassiopeiae)
ISSN号	0004-6256
通讯作者	Yang, YG (reprint author), Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China.
产权排序	第三完成单位
英文摘要	We present multicolor charge-coupled device (CCD) photometry for the eclipsing binary BS Cassiopeiae, observed on four nights between 2007 December and 2008 January. Using the Wilson -Devinney program, the photometric solution was derived from our BVR observations. Photometric results indicated that BS Cas is a W-subtype binary, whose mass ratio and overcontact degree are q = 0.2834(+/- 0.0010) and f = 31.6%(+/- 1.1%), respectively. Light curves of BS Cas present a typical O'Connell effect, which may be attributed to dark spot activity of the primary component. A detailed period analysis reveals that there exists a cyclic variation overlaying a secular period decrease, based on either all available light minimum times or recent light minimum times since 1989. The low-amplitude cyclic variation with a period of about 13 yr can be explained by either the light time effect or cyclic magnetic activity of both components. The long-term orbital period decrease suggests that BS Cas is undergoing mass transfer from the primary component to the secondary one. With its mass transfer and accompanying angular momentum loss, this binary will evolve into a deeper contact configuration.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	ORBITAL PERIOD CHANGES ; URSAE MAJORIS SYSTEMS ; ANGULAR-MOMENTUM LOSS ; LIGHT CURVES ; CONTACT BINARIES ; VELOCITY CURVES ; TY BOOTIS ; STARS ; EVOLUTION ; PEGASI
收录类别	SCI
原文出处	http://iopscience.iop.org/1538-3881/136/2/594/
语种	英语
WOS记录号	WOS:000257680000007
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5810]
专题	云南天文台_双星与变星研究组
作者单位	1.National Astronomical Observatories, Chinese Academy of Sciences, 100012 Beijing, China 2.Department of Physics and Electric Information, Huaibei Coal Industry Teachers College, 235000 Huaibei, Anhui Province, China 3.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, 650011 Kunming, China
推荐引用方式 GB/T 7714	Yang, YG,Wei, JY,He JJ. A photometric study of the neglected eclipsing binary BS Cassiopeiae[J]. ASTRONOMICAL JOURNAL,2008,136(2):594-601.
APA	Yang, YG,Wei, JY,&He JJ.(2008).A photometric study of the neglected eclipsing binary BS Cassiopeiae.ASTRONOMICAL JOURNAL,136(2),594-601.
MLA	Yang, YG,et al."A photometric study of the neglected eclipsing binary BS Cassiopeiae".ASTRONOMICAL JOURNAL 136.2(2008):594-601.