Asteroseismology for Probing the Interior Structure and Orbital Stability of Extremely Low Mass Ratio Contact Binaries
文献类型：期刊论文
| 作者 | Zhang, Xiaobin2; Chen XH(陈兴浩)1; Li Y(李焱)1; Fu, Jianning3,4 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2026-02-10 |
| 卷号 | 998期号:1 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ae2a2c |
| 产权排序 | 第2完成单位 |
| 通讯作者 | Zhang, Xiaobin(xzhang@bao.ac.cn) |
| 文献子类 | Article |
| 英文摘要 | Theoretical investigations predict a minimum mass ratio of about 0.085-0.095 for contact binaries. If the mass ratio is below the critical value, a tidal instability occurs, forcing the stars to merge into a single object. Observationally, however, more and more W UMa-type binaries have been found to have mass ratios lower than the theoretical limit. In this study, we try to solve this discrepancy by considering the stellar structure and evolution probed through asteroseismology. We searched for and detected gravity (g)- and Rossby (r)-mode pulsations in four contact binaries with mass ratios less than 0.1. A seismic study of the pulsations led us to identify the pulsation modes and determine the near-core and envelope rotation rates as well as the asymptotic period spacings of the pulsating, primary stars. By asteroseismic modeling, the stellar parameters were constrained, and the structure models were constructed. This enables us to determine the gyration radii of the primaries and investigate in detail the orbital stability of the contact systems. We indicate that both the mass and age have independent effects on orbital stability, with massive and older primaries being more stable. Moreover, differential core-to-surface rotation would significantly reduce the gyration radius and hence the minimum mass ratio of a contact system. Adopting the median value of the gyration radius derived for the four stars, we estimate a critical mass ratio of 0.042-0.044, depending on the filling factor. |
| URL标识 | 查看原文 |
| 出版地 | No.2 The Distillery, Glassfields, Avon Street, Bristol, ENGLAND |
| WOS关键词 | GAMMA DORADUS STARS ; ECLIPSING BINARY ; GRAVITY MODES ; RED GIANTS ; CONVECTIVE BOUNDARIES ; INTERNAL-ROTATION ; PERIOD SPACINGS ; MODULES ; PULSATIONS ; EVOLUTION |
| 资助项目 | China Manned Space Program[CMS-CSST-2025-A13]; National Natural Science Foundation of China[12427804]; National Natural Science Foundation of China[12373037]; National Natural Science Foundation of China[12373080] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001678856700001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | China Manned Space Program[CMS-CSST-2025-A13] ; National Natural Science Foundation of China[12427804, 12373037, 12373080] |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/28910]  |
| 专题 | 云南天文台_恒星物理研究组 |
| 通讯作者 | Zhang, Xiaobin |
| 作者单位 | 1.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, Kunming 650216, People’s Republic of China; 2.CAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China; xzhang@bao.ac.cn; 3.Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University, Beijing 102206, People’s Republic of China; 4.School of Physics and Astronomy, Beijing Normal University, Beijing 100875, People’s Republic of China |
| 推荐引用方式 GB/T 7714 | Zhang, Xiaobin,Chen XH,Li Y,et al. Asteroseismology for Probing the Interior Structure and Orbital Stability of Extremely Low Mass Ratio Contact Binaries[J]. ASTROPHYSICAL JOURNAL,2026,998(1). |
| APA | Zhang, Xiaobin,陈兴浩,李焱,&Fu, Jianning.(2026).Asteroseismology for Probing the Interior Structure and Orbital Stability of Extremely Low Mass Ratio Contact Binaries.ASTROPHYSICAL JOURNAL,998(1). |
| MLA | Zhang, Xiaobin,et al."Asteroseismology for Probing the Interior Structure and Orbital Stability of Extremely Low Mass Ratio Contact Binaries".ASTROPHYSICAL JOURNAL 998.1(2026). |
入库方式： OAI收割
来源：云南天文台
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