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Secular period decreasing of detached chromospherically active binaries
Luo, Chang Qing1,2,3,4; Zhang, Xiao Bin4; Deng, Li Cai4; Luo, Yang Ping1,2; Luo, Zhi Quan5; Yang, Shu Zheng5
2010-05-01
Source PublicationASTROPHYSICS AND SPACE SCIENCE
Volume327Issue:1Pages:9-17
AbstractThe 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.
KeywordDetached Binaries Chromospheric Active Binaries Period Decrease Magnetic Activity
DOI10.1007/s10509-010-0266-5
Indexed BySCI
Language英语
WOS IDWOS:000276204000002
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/7739
Collection光学天文研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 650011, Peoples R China
4.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
5.China W Normal Univ, Inst Theoret Phys, Nanchong 637002, Sichuan, Peoples R China
Recommended Citation
GB/T 7714
Luo, Chang Qing,Zhang, Xiao Bin,Deng, Li Cai,et al. Secular period decreasing of detached chromospherically active binaries[J]. ASTROPHYSICS AND SPACE SCIENCE,2010,327(1):9-17.
APA Luo, Chang Qing,Zhang, Xiao Bin,Deng, Li Cai,Luo, Yang Ping,Luo, Zhi Quan,&Yang, Shu Zheng.(2010).Secular period decreasing of detached chromospherically active binaries.ASTROPHYSICS AND SPACE SCIENCE,327(1),9-17.
MLA Luo, Chang Qing,et al."Secular period decreasing of detached chromospherically active binaries".ASTROPHYSICS AND SPACE SCIENCE 327.1(2010):9-17.
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