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- Title
Secular period decreasing of detached chromospherically active binaries.
- Authors
Chang Qing Luo; Xiao Bin Zhang; Li Cai Deng; Yang Ping Luo; Zhi Quan Luo; Shu Zheng Yang
- Abstract
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 −6.3×10−9 to −1.1×10−6 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, ), 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, $\dot{J}$ , are computed for each system. It shows that the AM have a similar change with the orbital period like d P/d t does, but $\log\dot{J}/J$ presents no strict changing with the kinematical ages.
- Subjects
ORBITS (Astronomy); ANGULAR momentum (Mechanics); ASTRONOMY; ORBITAL mechanics; ASTROPHYSICS
- Publication
Astrophysics & Space Science, 2010, Vol 327, Issue 1, p9
- ISSN
0004-640X
- Publication type
Article
- DOI
10.1007/s10509-010-0266-5