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Formation and evolution of W ursae majoris contact binaries
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
发表期刊ASTROPHYSICAL JOURNAL
2007-06-10
卷号662期号:1页码:596-601
DOI10.1086/517909
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收录类别SCI
关键词Binaries : Close Stars : Activity Stars : Evolution Stars : Formation
摘要The origin and evolution of WUMa systems are discussed based on All Sky Automated Survey (ASAS) data and the mean kinematic ages of four subgroups of 97 field contact binaries (FCBs). The period distribution of eclipsing binaries discovered by ASAS suggests that a period limit to tidal locking for the close binaries is about 2.24 days, so that most W UMa systems might be formed from detached binaries with periods PP2.24 days, and a maximum advanced time from a detached system to a W UMa is about 3.23 Gyr. Moreover, the secular evolution of the angular momentum (AM), the system mass, and the orbital period of 97 FCBs were investigated according to the mean kinematic ages, which were set according to AM bins. AMs, systemic masses, and orbital periods were shown to be decreasing with kinematic age. Their first-order decreasing rates have been determined as. J /J = 1.86; 10(-10) 10 yr(-1), M/M = 0.95; 10-10 yr(-1), and. P/P = 1.24; 10(-10) 10 yr(-1), and the average amplification (A A = d ln J /d ln M) is derived to be 1.96. These are lower than those derived from detached chromospherically active binaries (CABs). This suggests that the magnetic activity level of FCBs is indeed weaker than that of CABs. Meanwhile, the decreasing rate of AM of FCBs is found to be equal to an average value in a cycle of a cyclic model of contact binaries. This might suggest that the evolution of FCBs undergoes thermal relaxation oscillation (TRO) and that the coalescence of W UMa systems is a very long process, which is also indicated by the dynamical evolution of FCBs.
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-637X
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归档日期2007-06-11
WOS记录号WOS:000247074400048
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]CHROMOSPHERICALLY ACTIVE BINARIES ; ORBITAL PERIOD DECREASE ; ANGULAR-MOMENTUM LOSS ; PHYSICAL PARAMETERS ; MASS-RATIO ; ECLIPSING BINARIES ; SYSTEMS ; STARS ; COMPONENTS ; BOOTIS
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被引频次:37[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/114a53/4438
专题大样本恒星演化研究组
作者单位1.National Astronomical Observatories/Yunnan Observatory, CAS, P.O. Box 110, Kunming, Yunnan Province, 650011, China
2.Graduate University of the Chinese Academy of Sciences, Beijing, 100039
第一作者单位中国科学院云南天文台
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Li LF,Zhang FH,Han ZW,et al. Formation and evolution of W ursae majoris contact binaries[J]. ASTROPHYSICAL JOURNAL,2007,662(1):596-601.
APA Li LF,Zhang FH,Han ZW,&Jiang DK.(2007).Formation and evolution of W ursae majoris contact binaries.ASTROPHYSICAL JOURNAL,662(1),596-601.
MLA Li LF,et al."Formation and evolution of W ursae majoris contact binaries".ASTROPHYSICAL JOURNAL 662.1(2007):596-601.
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