When Does the Onset of Multiple Stellar Populations in Star Clusters Occur? Detection of Enriched Stellar Populations in NGC 2121
文献类型：期刊论文
| 作者 | Li,Chengyuan1,2,3; de Grijs,Richard1,2,4 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2019-05-08 |
| 卷号 | 876期号:2 |
| ISSN号 | 0004-637X |
| 关键词 | globular clusters: individual (NGC 2121) Hertzsprung–Russell and C–M diagrams |
| DOI | 10.3847/1538-4357/ab153b |
| 英文摘要 | Abstract Star-to-star light-element abundance variations, known as multiple stellar populations (MPs), are common in almost all Galactic globular clusters. Recently, MPs have also been detected in a number of massive clusters with ages in excess of 2 Gyr in the Large Magellanic Cloud (LMC), thus indicating that age is likely a control parameter for the presence of MPs. However, to conclusively confirm this notion, additional studies of star clusters in the LMC’s “age gap” of 3–6 Gyr are required. Here, we use Hubble Space Telescope observations to study the 3 Gyr old cluster NGC 2121. Compared with so-called “simple” stellar population models, the cluster’s red-giant branch exhibits an apparent spread in a specific color index that is sensitive to intrinsic chemical spreads. The observed spread can be explained by an intrinsic spread in nitrogen abundance of ～0.5–1.0 dex. NGC 2121 has a comparable mass to its younger counterparts without MPs, indicating that cluster mass might not be the dominant parameter controlling the presence of MPs. The transition phase between the occurrence of clusters with or without MPs seems to occur at ages of 2–3 Gyr, indicating that cluster age may play a dominant role in the establishment of MPs. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-876-2-AB153B |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/26165]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Department of Physics and Astronomy, Macquarie University, Sydney, NSW 2109, Australia; chengyuan.li@mq.edu.au 2.Centre for Astronomy, Astrophysics and Astrophotonics, Macquarie University, Sydney, NSW 2109, Australia 3.Key Laboratory for Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Beijing, People's Republic of China 4.International Space Science Institute–Beijing, 1 Nanertiao, Zhongguancun, Hai Dian District, Beijing 100190, People's Republic of China |
| 推荐引用方式 GB/T 7714 | Li,Chengyuan,de Grijs,Richard. When Does the Onset of Multiple Stellar Populations in Star Clusters Occur? Detection of Enriched Stellar Populations in NGC 2121[J]. The Astrophysical Journal,2019,876(2). |
| APA | Li,Chengyuan,&de Grijs,Richard.(2019).When Does the Onset of Multiple Stellar Populations in Star Clusters Occur? Detection of Enriched Stellar Populations in NGC 2121.The Astrophysical Journal,876(2). |
| MLA | Li,Chengyuan,et al."When Does the Onset of Multiple Stellar Populations in Star Clusters Occur? Detection of Enriched Stellar Populations in NGC 2121".The Astrophysical Journal 876.2(2019). |
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