New Insights into the Formation of the Blue Main Sequence in NGC 1850
文献类型：期刊论文
| 作者 | Yang,Yujiao1,2; Li,Chengyuan3; Deng,Licai2 ; Grijs,Richard de1,3,4; Milone,Antonino P.5,6
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| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2018-05-29 |
| 卷号 | 859期号:2 |
| ISSN号 | 0004-637X |
| 关键词 | globular clusters: individual (NGC 1850) Hertzsprung–Russell and C–M diagrams Magellanic Clouds |
| 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 |
| 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). |
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来源：国家天文台
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