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 |
DOI | 10.1086/517909 |
产权排序 | 第1完成单位 |
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 |
ISSN | 0004-637X |
URL | 查看原文 |
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 |
引用统计 | |
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 |
推荐引用方式 GB/T 7714 | 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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