Merger of Noncompact Binaries: Triggering Mechanisms and Merger Timescales of W UMa Contact Binaries
文献类型：期刊论文
| 作者 | Jiang DK(姜登凯)2; Chen K(陈琨)1,2; Li J(李蛟)2; Ge HW(葛宏伟)2; Li ZW(李振威)2; Chen HL(陈海亮)2; Chen XF(陈雪飞)2; Han ZW(韩占文)2 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2026-02-20 |
| 卷号 | 998期号:2 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ae3720 |
| 产权排序 | 第1完成单位 |
| 文献子类 | Article |
| 英文摘要 | The merger of noncompact binaries can produce a variety of significant celestial objects, including blue stragglers, luminous red novae, and others. However, several key details of the merger of noncompact binaries remain unclear. Using the MESA stellar evolution code, we investigate the triggering mechanisms and merger timescales of observed W UMa contact binaries (a type of noncompact binary that is closest to merging). Our results show that for the majority of observed W UMa contact binaries (89%), the merger-triggering mechanism is tidal instability, while thermal instability accounts for the remaining cases (11%). We suggest that tidal instability is the dominant mechanism for triggering the mergers of W UMa contact binaries. In addition, our results indicate that the distribution of merger timescales for observed W UMa contact binaries ranges from similar to 2.5 Myr to similar to 1.0 Gyr, peaking at 0.26 Gyr, with an average merger timescale of 0.36 Gyr. We suggest that the merger timescale of each W UMa contact binary may be a more comprehensive criterion for identifying potential merger candidates than the mass ratio or other individual parameters. Finally, we present some promising merger candidates of W UMa contact binaries (e.g., those with the shortest or undetermined merger timescales) for future studies on noncompact binary mergers. |
| 学科主题 | 天文学 ; 恒星与银河系 |
| URL标识 | 查看原文 |
| 出版地 | No.2 The Distillery, Glassfields, Avon Street, Bristol, ENGLAND |
| WOS关键词 | MINIMUM MASS-RATIO ; COMMON ENVELOPE EVOLUTION ; MAJORIS TYPE SYSTEMS ; CASE-A EVOLUTION ; URSAE-MAJORIS ; CONVECTIVE BOUNDARIES ; ECLIPSING BINARIES ; PERIOD VARIATIONS ; BLUE STRAGGLERS ; ENERGY-TRANSFER |
| 资助项目 | MOST divided by National Natural Science Foundation of China (NSFC)[12288102]; MOST divided by National Natural Science Foundation of China (NSFC)[12473033]; MOST divided by National Natural Science Foundation of China (NSFC)[12073070]; MOST divided by National Natural Science Foundation of China (NSFC)[12333008]; MOST divided by National Natural Science Foundation of China (NSFC)[12090040/3]; MOST divided by National Natural Science Foundation of China (NSFC)[12473034] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001688686900001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | MOST divided by National Natural Science Foundation of China (NSFC)[12288102, 12473033, 12073070, 12333008, 12090040/3, 12473034] |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/28926]  |
| 专题 | 云南天文台_大样本恒星演化研究组 |
| 通讯作者 | Jiang DK(姜登凯) |
| 作者单位 | 1.University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China 2.International Centre of Supernovae (ICESUN), Yunnan Key Laboratory of Supernova Research, Yunnan Observatories, Chinese Academy of Sciences (CAS), Kunming 650216, People’s Republic of China; dengkai@ynao.ac.cn, zhanwenhan@ynao.ac.cn; |
| 推荐引用方式 GB/T 7714 | Jiang DK,Chen K,Li J,et al. Merger of Noncompact Binaries: Triggering Mechanisms and Merger Timescales of W UMa Contact Binaries[J]. ASTROPHYSICAL JOURNAL,2026,998(2). |
| APA | 姜登凯.,陈琨.,李蛟.,葛宏伟.,李振威.,...&韩占文.(2026).Merger of Noncompact Binaries: Triggering Mechanisms and Merger Timescales of W UMa Contact Binaries.ASTROPHYSICAL JOURNAL,998(2). |
| MLA | 姜登凯,et al."Merger of Noncompact Binaries: Triggering Mechanisms and Merger Timescales of W UMa Contact Binaries".ASTROPHYSICAL JOURNAL 998.2(2026). |
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来源：云南天文台
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