LY Aurigua: A mass-transferring O-type contact binary with a tertiary stellar companion

	LY Aurigua: A mass-transferring O-type contact binary with a tertiary stellar companion
	Zhao EG(赵二刚)1,2 ; Qian SB(钱声帮)1,2,3 ; Li LJ(李临甲)1,2,3 ; He JJ(何家佳)1,2 ; Liu L(刘亮)1,2 ; Wang JJ(王晶晶)1,2,3 ; Zhang J(张嘉)1,2,3
刊名	NEW ASTRONOMY
	2014-01
卷号	26 页码:112-115
关键词	Stars:binary:close Stars:binaries:eclipsing Stars:individual (LY AUR)
ISSN号	1384-1076
通讯作者	Zhao, EG (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	LY Aur is a contact massive close binary with a period of a little more than four days. The first O - C analysis of this early-type binary presented in this paper suggests that the period of the system is increasing continuously at a rate of dP/dt = +7.2 x 10(-7) days/year, while a cyclic oscillation with the period of 12.5 years is obvious. The long-term increasing can be explained by mass transfer from the less massive companion to the more one on the nuclear time-scale of less massive body, which suggests that the contact configuration will be broken and this binary will evolve into a semi-detached system. The periodic oscillation may be the consequence of the light-travel time effect of the third body, whose mass is no less than 3.4 M-circle dot. It is expected that the third body may play an important role for the origin and evolution of the system by removing angular momentum from the central system, making the eclipsing pairs to have a low angular momentum, while initially it may have had a longer orbital period, with larger angular momentum. The original system may have evolved into the present contact configuration via a case A mass transfer. (C) 2013 Elsevier B.V. All rights reserved.
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]	ECLIPSING BINARIES ; EVOLUTION ; SYSTEMS ; CEPHEI
收录类别	SCI
原文出处	http://www.sciencedirect.com/science/article/pii/S1384107613000833
语种	英语
WOS记录号	WOS:000325510600013
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5909]
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.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China 2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 650011 Kunming, China 3.University of the Chinese Academy of Sciences, Beijing 100049, China
推荐引用方式 GB/T 7714	Zhao EG,Qian SB,Li LJ,et al. LY Aurigua: A mass-transferring O-type contact binary with a tertiary stellar companion[J]. NEW ASTRONOMY,2014,26:112-115.
APA	Zhao EG.,Qian SB.,Li LJ.,He JJ.,Liu L.,...&Zhang J.(2014).LY Aurigua: A mass-transferring O-type contact binary with a tertiary stellar companion.NEW ASTRONOMY,26,112-115.
MLA	Zhao EG,et al."LY Aurigua: A mass-transferring O-type contact binary with a tertiary stellar companion".NEW ASTRONOMY 26(2014):112-115.