New Insights into the Formation of the Blue Main Sequence in NGC 1850

doi:10.3847/1538-4357/aabe26

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	New Insights into the Formation of the Blue Main Sequence in NGC 1850
	Yang,Yujiao 1,2; Li,Chengyuan 3; Deng,Licai 2; Grijs,Richard de 1,3,4; Milone,Antonino P.5,6
刊名	The Astrophysical Journal
	2018-05-29
卷号	859 期号:2
关键词	globular clusters: individual (NGC 1850) Hertzsprung–Russell and C–M diagrams Magellanic Clouds
ISSN号	0004-637X
DOI	10.3847/1538-4357/aabe26
英文摘要	Abstract Recent discoveries of bimodal main sequences (MSs) associated with young clusters (with ages ?1 Gyr) in the Magellanic Clouds have drawn a lot of attention. One of the prevailing formation scenarios attributes these split MSs to a bimodal distribution in stellar rotation rates, with most stars belonging to a rapidly rotating population. In this scenario, only a small fraction of stars populating a secondary blue sequence are slowly or non-rotating stars. Here, we focus on the blue MS in the young cluster NGC 1850. We compare the cumulative number fraction of the observed blue-MS stars to that of the high-mass-ratio binary systems at different radii. The cumulative distributions of both populations exhibit a clear anti-correlation, characterized by a highly significant Pearson coefficient of ?0.97. Our observations are consistent with the possibility that blue-MS stars are low-mass-ratio binaries, and therefore their dynamical disruption is still ongoing. High-mass-ratio binaries, on the other hand, are more centrally concentrated.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-859-2-AABE26
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/21711]
专题	中国科学院国家天文台
作者单位	1.Kavli Institute for Astronomy and Astrophysics and Department of Astronomy, Peking University, Yi He Yuan Lu 5, Hai Dian District, Beijing 100871, People's Republic of China 2.Key Laboratory for Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, People's Republic of China 3.Department of Physics and Astronomy, Macquarie University, Balaclava Road, Sydney, NSW 2109, Australia 4.International Space Science Institute–Beijing, 1 Nanertiao, Zhongguancun, Hai Dian District, Beijing 100190, People's Republic of China 5.Dipartimento di Fisica e Astronomia “Galileo Galilei,” Università di Padova, Vicolo dell’Osservatorio 3, I-35122 Padova, Italy 6.Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611, Australia
推荐引用方式 GB/T 7714	Yang,Yujiao,Li,Chengyuan,Deng,Licai,et al. New Insights into the Formation of the Blue Main Sequence in NGC 1850[J]. The Astrophysical Journal,2018,859(2).
APA	Yang,Yujiao,Li,Chengyuan,Deng,Licai,Grijs,Richard de,&Milone,Antonino P..(2018).New Insights into the Formation of the Blue Main Sequence in NGC 1850.The Astrophysical Journal,859(2).
MLA	Yang,Yujiao,et al."New Insights into the Formation of the Blue Main Sequence in NGC 1850".The Astrophysical Journal 859.2(2018).