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Origin of extended main-sequence turn-off in open cluster NGC 2355

文献类型：期刊论文

作者Maurya, Jayanand2; Samal, M. R.3; Amard, Louis4; Zhang, Yu2,5; Niu, Hubiao2; Kim, Sang Chul6,7; Joshi, Y. C.1; Kumar, B.1
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2024-07-04
卷号532期号:1页码:1212-1222
关键词techniques: spectroscopic Hertzsprung-Russell and colour-magnitude diagrams stars: rotation open clusters and associations: individual: NGC 2355
ISSN号0035-8711
DOI10.1093/mnras/stae1611
产权排序1
英文摘要The presence of extended Main-Sequence Turn-Off (eMSTO) in the open clusters has been attributed to various factors, such as spread in rotation rates, binary stars, and dust-like extinction from stellar excretion discs. We present a comprehensive analysis of the eMSTO in the open cluster NGC 2355. Using spectra from the Gaia-European Southern Observatory (ESO) archives, we find that the stars in the red part of the eMSTO have a higher mean v sin i value of 135.3 +/- 4.6 km s(-1) compared to the stars in the blue part that have an average v sin i equal to 81.3 +/- 5.6 km s(-1). This suggests that the eMSTO in NGC 2355 is possibly caused by the spread in rotation rates of stars. We do not find any substantial evidence of the dust-like extinction from the eMSTO stars using ultraviolet data from the Swift survey. The estimated synchronization time for low-mass ratio close binaries in the blue part of the eMSTO suggests that they would be mostly slow-rotating if present. However, the stars in the blue part of the eMSTO are preferentially located in the outer region of the cluster indicating that they may lack low-mass ratio close binaries. The spread in rotation rates of eMSTO stars in NGC 2355 is most likely caused by the star-disc interaction mechanism. The stars in the lower main sequence beyond the eMSTO region of NGC 2355 are slow rotating (mean v sin i = 26.5 +/- 1.3 km s(-1)) possibly due to the magnetic braking of their rotations.
WOS关键词STELLAR ROTATION ; STAR-CLUSTERS ; CHEMICAL ABUNDANCES ; MASS-LUMINOSITY ; AGE ; EVOLUTION ; GAIA ; ENVIRONMENT ; PARAMETERS ; ACCRETION
资助项目Chinese Academy of Sciences[2022-XBQNXZ-013] ; Chinese Academy of Sciences (CAS) 'Light of West China' Program[2022D01E86] ; Natural Science Foundation of Xinjiang Uygur Autonomous Region[U2031204] ; National Natural Science Foundation of China
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001262852600003
出版者OXFORD UNIV PRESS
资助机构Chinese Academy of Sciences ; Chinese Academy of Sciences (CAS) 'Light of West China' Program ; Natural Science Foundation of Xinjiang Uygur Autonomous Region ; National Natural Science Foundation of China
源URL[http://ir.xao.ac.cn/handle/45760611-7/6822]  
专题110米口径全可动射电望远镜（QTT）_110米大口径全可动射电望远镜关键技术研究（973项目）_课题1：大样本射电天体的观测和前沿问题研究_特邀报告
新疆天文台_光学天文与技术应用研究室
光学天文与技术应用研究室_星团与星系研究团组
通讯作者Maurya, Jayanand
作者单位1.Aryabhatta Res Inst Observat Sci ARIES, Naini Tal 263002, India
2.Chinese Acad Sci, Xinjiang Astron Observ, 150,Sci 1 St, Urumqi 830011, Xinjiang, Peoples R China
3.Phys Res Lab, Astron & Astrophys Div, Ahmadabad 380009, India
4.Univ Paris Cite, Univ Paris Saclay, CEA, AIM,CNRS, F-91191 Gif Sur Yvette, France
5.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China
6.Korea Astron & Space Sci Inst, 776 Daedeokdae Ro, Daejeon 34055, South Korea
7.Korea Univ Sci & Technol UST, 217 Gajeong Ro, Daejeon 305350, South Korea
推荐引用方式
GB/T 7714		 Maurya, Jayanand,Samal, M. R.,Amard, Louis,et al. Origin of extended main-sequence turn-off in open cluster NGC 2355[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2024,532(1):1212-1222.
APA Maurya, Jayanand.,Samal, M. R..,Amard, Louis.,Zhang, Yu.,Niu, Hubiao.,...&Kumar, B..(2024).Origin of extended main-sequence turn-off in open cluster NGC 2355.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,532(1),1212-1222.
MLA Maurya, Jayanand,et al."Origin of extended main-sequence turn-off in open cluster NGC 2355".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 532.1(2024):1212-1222.

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来源：新疆天文台

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