Evidence for Dynamical Filtering: High Binary Fraction, Hard-binary Excess, and Unresolved Triples in the Surviving Core of NGC 6791
文献类型：期刊论文
| 作者 | Chi, Huanbin1,2,3,4; Li Z(李志)5,6; Wang, Feng3,4; Tian, Xuefen2; Chang, Linfeng2; Liu, Hongbo1; Liu, Yiqin2 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2026-06-01 |
| 卷号 | 1003期号:2 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ae690f |
| 产权排序 | 第5完成单位 |
| 文献子类 | Article |
| 英文摘要 | We present a deep photometric analysis of the main-sequence (MS) population in the old, metal-rich open cluster (OC) NGC 6791 using Gaia Data Release 3 data. After correcting for differential reddening, we use the Bayesian model comparison to test whether stellar rotation can account for the observed MS broadening and find that a rotation-dominated interpretation is strongly disfavored. We therefore infer that unresolved multiplicity is the primary contributor to the photometric offsets. We derive a high-q companion fraction of 54.3% +/- 2.8% for systems with q greater than or similar to 0.5, significantly higher than typical values reported for most OCs and the field. The inferred offset distribution is not consistent with a flat mass-ratio distribution but instead shows an excess toward high mass ratios (q similar to 0.8-1.0), suggestive of preferential survival of hard binaries in a dynamically evolved environment. We also identify a population of stars lying above the equal-mass binary limit (Delta G > 0.75 mag), which is difficult to explain with ordinary MS binaries alone and is plausibly interpreted as candidate unresolved triple or higher-order multiple systems. A Kolmogorov-Smirnov test, together with Monte Carlo label-shuffling experiments, shows no statistically significant difference between the projected radial distributions of the single-star and binary/multiple populations within the observed field. Taken together, these results are consistent with the picture that NGC 6791 is the dynamically processed inner remnant of a once more massive cluster. |
| 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 | OPEN CLUSTER ; EVOLUTION ; SEQUENCE ; OLD ; MULTIPLICITY ; SYSTEMS ; AGE |
| 资助项目 | MOST divided by National Natural Science Foundation of China (NSFC)[12433012] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001773934700001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | MOST divided by National Natural Science Foundation of China (NSFC)[12433012] |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/29243]  |
| 专题 | 云南天文台_恒星物理研究组 |
| 通讯作者 | Wang, Feng |
| 作者单位 | 1.Institute of Artificial Intelligence Applications, Yunnan Open University, Kunming 650599, People’s Republic of China; 2.School of Artificial Intelligence, Yunnan Open University, Kunming 650599, People’s Republic of China; 3.Center For Astrophysics, Guangzhou University, Guangzhou, Guangdong 510006, People’s Republic of China; fengwang@gzhu.edu.cn; 4.Great Bay Center, National Astronomical Data Center, Guangzhou, Guangdong 510006, People’s Republic of China; 5.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, People’s Republic of China; 6.Key Laboratory for Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, People’s Republic of China |
| 推荐引用方式 GB/T 7714 | Chi, Huanbin,Li Z,Wang, Feng,et al. Evidence for Dynamical Filtering: High Binary Fraction, Hard-binary Excess, and Unresolved Triples in the Surviving Core of NGC 6791[J]. ASTROPHYSICAL JOURNAL,2026,1003(2). |
| APA | Chi, Huanbin.,李志.,Wang, Feng.,Tian, Xuefen.,Chang, Linfeng.,...&Liu, Yiqin.(2026).Evidence for Dynamical Filtering: High Binary Fraction, Hard-binary Excess, and Unresolved Triples in the Surviving Core of NGC 6791.ASTROPHYSICAL JOURNAL,1003(2). |
| MLA | Chi, Huanbin,et al."Evidence for Dynamical Filtering: High Binary Fraction, Hard-binary Excess, and Unresolved Triples in the Surviving Core of NGC 6791".ASTROPHYSICAL JOURNAL 1003.2(2026). |
入库方式： OAI收割
来源：云南天文台
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