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Secular period decreasing of detached chromospherically active binaries

文献类型：期刊论文

作者Luo CQ(罗常青)1,2,3,4; Zhang, XB4; Deng, LC4; Luo YP(罗杨平)1,2; Luo, ZQ5; Yang, SZ5
刊名ASTROPHYSICS AND SPACE SCIENCE
出版日期2010-05
卷号327期号:1页码:9-17
关键词Detached binaries Chromospheric active binaries Period decrease Magnetic activity
ISSN号0004-640X
产权排序第一完成单位
通讯作者Luo, CQ (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China.
英文摘要The long-term orbital period changes of a large sample of detached chromospherically active binaries (CABs) were studied. Eleven such systems were found to be undergoing secular period decreases with the rates of -6.3 x 10(-9) to -1.1 x 10(-6) days per year. The period decreasing rates are found to vary depending on the orbital period. The longer the orbital period is, the more rapidly the period decreases. Following Stepien (Mon. Not. R. Astron. Soc. 274: 1019, 1995), the period decreasing rate predicted by angular momentum loss (AML) caused by magnetic wind is computed for each system. A comparison between the observed and calculated period decreasing rates shows that the former values are obviously larger than the latter by 1-3 orders of magnitude. It suggests that the magnetic wind is not likely the determinant mechanism driving the AML in these systems. Finally, the orbital angular momentum (AM) and the rate of AML, (J) over dot, are computed for each system. It shows that the AM have a similar change with the orbital period like dP/dt does, but log (J) over dot/J presents no strict changing with the kinematical ages.
WOS标题词Science & Technology ; Physical Sciences
学科主题Astronomy & Astrophysics
类目[WOS]Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
关键词[WOS]ANGULAR-MOMENTUM LOSS ; ORBITAL PERIOD ; CONTACT BINARIES ; CLOSE BINARIES ; SZ-PISCIUM ; MASS ; EVOLUTION ; HERCULIS
收录类别SCI
原文出处http://link.springer.com/article/10.1007%2Fs10509-010-0266-5
语种英语
WOS记录号WOS:000276204000002
源URL[http://ir.ynao.ac.cn/handle/114a53/5200]  
专题云南天文台_恒星物理研究组
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, The Chinese Academy of Sciences, Kunming, 650011, China
2.Graduate University of Chinese Academy of Sciences, Beijing, 100049, China
3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, 650011, China
4.National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012, China
5.Institute of Theoretical Physics, China West Normal University, Nanchong, Sichuan, 637002, China
推荐引用方式
GB/T 7714		 Luo CQ,Zhang, XB,Deng, LC,et al. Secular period decreasing of detached chromospherically active binaries[J]. ASTROPHYSICS AND SPACE SCIENCE,2010,327(1):9-17.
APA Luo CQ,Zhang, XB,Deng, LC,Luo YP,Luo, ZQ,&Yang, SZ.(2010).Secular period decreasing of detached chromospherically active binaries.ASTROPHYSICS AND SPACE SCIENCE,327(1),9-17.
MLA Luo CQ,et al."Secular period decreasing of detached chromospherically active binaries".ASTROPHYSICS AND SPACE SCIENCE 327.1(2010):9-17.

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来源：云南天文台

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