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Tidal Stripping as the Driver of Mass Segregation in the Young Open Cluster NGC 2422

文献类型：期刊论文

作者Chi, Huanbin4,6,7; Tian, Xuefen7; Yang, Jingcheng7; Wang, Feng4,5; Ding X(丁旭)1; Chen, Jing3; Wang, Yudan2
刊名ASTRONOMICAL JOURNAL
出版日期2026-03-02
卷号171期号:3页码:9
ISSN号0004-6256
DOI10.3847/1538-3881/ae3759
产权排序第5完成单位
通讯作者Tian, Xuefen(18382204138@163.com) ; Wang, Feng(fengwang@gzhu.edu.cn)
文献子类Article
英文摘要We present strong evidence that mass segregation in the young open cluster NGC 2422 (age approximate to 84 Myr) is primarily driven by tidal stripping. Analysis of the radial mass distribution reveals a significant overabundance of low-mass stars (M < 0.85 M-circle dot) preferentially located near and beyond the cluster's tidal radius (r(t) = 14.4 pc), a hallmark of ongoing tidal stripping. This spatial signature is corroborated by kinematic evidence: the cluster's outskirts exhibit an elevated velocity dispersion (sigma(3d) = 14.9 km s(-1), F-test p < 0.001) and strong radial anisotropy (beta = 0.94 +/- 0.4), both classic signatures of tidal influence. The cluster's age is significantly greater than its half-mass relaxation time (t(rh) = 44.2 Myr), confirming it is dynamically evolved. Crucially, binary stars show no significant radial segregation from single stars (KS-test p approximate to 0.51), ruling them out as the primary driver. Collectively, these results establish tidal stripping as the dominant mechanism currently reshaping the structure and stellar content of NGC 2422.
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ALL-SKY ; STAR-CLUSTERS ; PARAMETERS ; EVOLUTION
资助项目China National Science Foundation[12433012]; China National Science Foundation[12373097]; China National SKA Programme[2025SKA0160100]; Yunnan Basic Research Program[202501AT070027]; Basic and Applied Basic Research Foundation of Guangdong Provincelied[2024A1515011503]; Guangzhou Science and Technology Funds[2023A03J0016]; On-campus Construction Project of the Artificial Intelligence Laboratory, Yunnan Open University[non]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001691350400001
出版者IOP Publishing Ltd
资助机构China National Science Foundation[12433012, 12373097] ; China National SKA Programme[2025SKA0160100] ; Yunnan Basic Research Program[202501AT070027] ; Basic and Applied Basic Research Foundation of Guangdong Provincelied[2024A1515011503] ; Guangzhou Science and Technology Funds[2023A03J0016] ; On-campus Construction Project of the Artificial Intelligence Laboratory, Yunnan Open University[non]
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/28921]  
专题天文技术实验室
通讯作者Tian, Xuefen; Wang, Feng
作者单位1.Yunnan Observatories, Chinese Academy of Sciences (CAS), P.O. Box 110, 650216, Kunming, People’s Republic of China;
2.The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, Hong Kong Special Administrative Region, People’s Republic of China
3.Dali University, No. 2, Hongsheng Road, Gucheng, Dali, Yunnan, Dali 671003, People’s Republic of China;
4.Center For Astrophysics, Guangzhou University, Guangzhou, Guangdong 510006, People’s Republic of China; fengwang@gzhu.edu.cn;
5.Great Bay Center, National Astronomical Data Center, Guangzhou, Guangdong 510006, People’s Republic of China;
6.Institute of Artificial Intelligence Applications, Yunnan Open University, Kunming 650599, People’s Republic of China;
7.School of Artificial Intelligence, Yunnan Open University, Kunming 650599, People’s Republic of China; 18382204138@163.com;
推荐引用方式
GB/T 7714		 Chi, Huanbin,Tian, Xuefen,Yang, Jingcheng,et al. Tidal Stripping as the Driver of Mass Segregation in the Young Open Cluster NGC 2422[J]. ASTRONOMICAL JOURNAL,2026,171(3):9.
APA Chi, Huanbin.,Tian, Xuefen.,Yang, Jingcheng.,Wang, Feng.,丁旭.,...&Wang, Yudan.(2026).Tidal Stripping as the Driver of Mass Segregation in the Young Open Cluster NGC 2422.ASTRONOMICAL JOURNAL,171(3),9.
MLA Chi, Huanbin,et al."Tidal Stripping as the Driver of Mass Segregation in the Young Open Cluster NGC 2422".ASTRONOMICAL JOURNAL 171.3(2026):9.

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