The evolutionary status of W Ursae Majoris-type systems

doi:10.1111/j.1365-2966.2008.12736.x

YNAO OpenIR > 大样本恒星演化研究组

	The evolutionary status of W Ursae Majoris-type systems
	Li LF(李立芳)1 ; Zhang FH(张奉辉)1 ; Han ZW(韩占文)1 ; Jiang DK(姜登凯)1,2 ; Jiang TY(姜天雨)1,2 ; Li, LF (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Yunnan, Peoples R China.
发表期刊	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2008-06-11
卷号	387 期号:1 页码:97-104
DOI	10.1111/j.1365-2966.2008.12736.x
产权排序	第1完成单位
收录类别	SCI
关键词	Binaries : Close Stars : Evolution Stars : Magnetic Fields Stars : Mass-loss
摘要	Well-determined physical parameters of 130 W Ursae Majoris (W UMa) systems were collected from the literature. Based on these data, the evolutionary status and dynamical evolution of W UMa systems are investigated. It is found that there is no evolutionary difference between W- and A-type systems in the M-J diagram, which is consistent with the results derived from the analysis of observed spectral type and of M-R and M-L diagrams of W UMa systems. M-R and M-L diagrams of W- and A-type systems indicate that a large amount of energy should be transferred from the more massive to the less massive component, so that they are not in thermal equilibrium and undergo thermal relaxation oscillation. Moreover, the distribution of angular momentum, together with the distribution of the mass ratio, suggests that the mass ratio of the observed W UMa systems decreases with decreasing total mass. This could be the result of the dynamical evolution of W UMa systems, which suffer angular momentum loss and mass loss as a result of the magnetic stellar wind. Consequently, the tidal instability forces these systems towards lower q values and finally to rapidly rotating single stars.
语种	英语
学科领域	Astronomy & Astrophysics
文章类型	Article
ISSN	0035-8711
URL	查看原文
归档日期	2008-06-18
WOS记录号	WOS:000256378700009
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	CONTACT BINARY STARS ; WUMA-TYPE BINARIES ; MASS-RATIO ; PHYSICAL PARAMETERS ; ECLIPSING BINARIES ; ABSOLUTE DIMENSIONS ; RADIAL-VELOCITY ; COMPONENTS ; ENERGY ; BOOTIS
引用统计	被引频次：57[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/4453
专题	大样本恒星演化研究组
通讯作者	Li, LF (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Yunnan, Peoples R China.
作者单位	1.National Astronomical Observatories, Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, Kunming, Yunnan Province 650011, China 2.Graduate University of Chinese Academy of Sciences, Beijing 100039, China
第一作者单位	中国科学院云南天文台
推荐引用方式 GB/T 7714	Li LF,Zhang FH,Han ZW,et al. The evolutionary status of W Ursae Majoris-type systems[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2008,387(1):97-104.
APA	Li LF,Zhang FH,Han ZW,Jiang DK,Jiang TY,&Li, LF .(2008).The evolutionary status of W Ursae Majoris-type systems.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,387(1),97-104.
MLA	Li LF,et al."The evolutionary status of W Ursae Majoris-type systems".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 387.1(2008):97-104.

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