New Period Investigation of Near Contact Binary BF Virginis

	New Period Investigation of Near Contact Binary BF Virginis
	Zhu LY(朱俐颖)1,2 ; Qian SB(钱声帮)1,2 ; Li LJ(李临甲)1,2
刊名	PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
	2012-10-25
卷号	64 期号:5 页码:94-98
关键词	Stars: binaries: eclipsing Stars: individual: BF Virginis Stars: flare
ISSN号	0004-6264
通讯作者	Zhu, LY (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Obser, POB 110, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	The near contact binary BF Virginis was monitored by us from 2007 to 2011 with the 60-cm telescope of Yunnan Observatory. Eight new observed times of light minimum were derived. All of the available eclipse times, spanning more than 100 yr, were analyzed. It is found that there exists a cyclic variation with a semi-amplitude of 0.034 d and a period of 63.3 yr, superposed by an upward parabolic variation. The upward parabolic change can be explained as a continuous period increase due to mass transfer from the secondary to the primary component of BF Vir, which supports the secondary filling near contact configuration. The period oscillation can be explained either by the light-time effect due to the presence of a third body or by magnetic activity. If it is caused by the light-time effect, the minimum mass and the corresponding orbital radius of the additional body should be m(3) = 0.93 M-circle dot and a(3) = 19.4 AU, respectively. On the other hand, the period oscillation may be explained as a consequence of magnetic cycles in its secondary component. In this case, the required variation of the quadrupole moment is calculated to be Delta Q = 2.1 x 10(50) g cm(2).
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 ; CLOSE-BINARY ; CASSIOPEIAE ; MODULATION ; VIR
收录类别	SCI
原文出处	http://pasj.oxfordjournals.org/content/64/5/94
语种	英语
WOS记录号	WOS:000313147600006
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5861]
专题	云南天文台_双星与变星研究组云南天文台_中国科学院天体结构与演化重点实验室
作者单位	1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, P. R. China 2.Key Laboratory for the Structure and Evolution of Celestial Bodies, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, P. R. China
推荐引用方式 GB/T 7714	Zhu LY,Qian SB,Li LJ. New Period Investigation of Near Contact Binary BF Virginis[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2012,64(5):94-98.
APA	Zhu LY,Qian SB,&Li LJ.(2012).New Period Investigation of Near Contact Binary BF Virginis.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,64(5),94-98.
MLA	Zhu LY,et al."New Period Investigation of Near Contact Binary BF Virginis".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 64.5(2012):94-98.