Stellar Rotation and the Extended Main-sequence Turnoff in the Open Cluster NGC 5822
文献类型：期刊论文
| 作者 | Sun,Weijia1; Grijs,Richard de2,3; Deng,Licai4,5,6 ; Albrow,Michael D.7
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| 刊名 | The Astrophysical Journal
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| 出版日期 | 2019-05-09 |
| 卷号 | 876期号:2 |
| 关键词 | galaxies: star clusters: general open clusters and associations: individual (NGC 5822) stars: rotation |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab16e4 |
| 英文摘要 | Abstract The origin of extended main-sequence turnoffs (eMSTOs) in intermediate-age (1–3 Gyr) clusters is one of the most intriguing questions in current star cluster research. Unlike the split main sequences found in some globular clusters, which are caused by bimodal populations in age and/or chemical abundances, eMSTOs are believed to be due to stellar rotation. We present a spectroscopic survey of MSTO stars in a nearby, intermediate-age (0.9 Gyr), low-mass (～1.7?×?103 M⊙) Galactic open cluster, NGC 5822. We derive a clean sample of member stars based on Gaia proper motions and parallaxes and confirm the existence of an eMSTO. Using medium-resolution (R?～?4000) Southern African Large Telescope spectra, we derive the rotational velocities of 24 member stars (representing 20% completeness around the eMSTO region) and find that the loci of the main-sequence stars in the eMSTO region show a clear correlation with the projected rotational velocities in the sense that fast rotators are located on the red side of the eMSTO and slow rotators are found on the blue side. By comparison with a synthetic cluster model, we show that the stellar rotational velocities and the eMSTO of NGC 5822 can be well reproduced, and we conclude that stellar rotation is the main cause of the eMSTO in NGC 5822. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-876-2-AB16E4 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/26208]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Kavli Institute for Astronomy & Astrophysics and Department of Astronomy, Peking University, Yi He Yuan Lu 5, Hai Dian District, Beijing 100871, People's Republic of China 2.Department of Physics and Astronomy, Macquarie University, Balaclava Road, Sydney, NSW 2109, Australia 3.International Space Science Institute—Beijing, 1 Nanertiao, Hai Dian District, Beijing 100190, People's Republic of China 4.Key Laboratory for Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, People's Republic of China 5.School of Astronomy and Space Science, University of the Chinese Academy of Sciences, Huairou 101408, People's Republic of China 6.Department of Astronomy, China West Normal University, Nanchong 637002, People's Republic of China 7.School of Physical and Chemical Sciences, University of Canterbury, Private Bag 4800, Christchurch, New Zealand |
| 推荐引用方式 GB/T 7714 | Sun,Weijia,Grijs,Richard de,Deng,Licai,et al. Stellar Rotation and the Extended Main-sequence Turnoff in the Open Cluster NGC 5822[J]. The Astrophysical Journal,2019,876(2). |
| APA | Sun,Weijia,Grijs,Richard de,Deng,Licai,&Albrow,Michael D..(2019).Stellar Rotation and the Extended Main-sequence Turnoff in the Open Cluster NGC 5822.The Astrophysical Journal,876(2). |
| MLA | Sun,Weijia,et al."Stellar Rotation and the Extended Main-sequence Turnoff in the Open Cluster NGC 5822".The Astrophysical Journal 876.2(2019). |
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来源：国家天文台
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