Multiple Populations in Low-mass Globular Clusters: Palomar 13
文献类型：期刊论文
| 作者 | Tang,Baitian2; Wang,Yue1 ; Huang,Ruoyun2; Li,Chengyuan2; Yu,Jincheng2; Geisler,Doug8,9,10; Dias,Bruno7; Fernández-Trincado,José G.5,6; Carballo-Bello,Julio A.7; Cabrera-Lavers,Antonio3,4
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| 刊名 | The Astrophysical Journal
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| 出版日期 | 2021-02-01 |
| 卷号 | 908期号:2 |
| 关键词 | Globular star clusters Stellar kinematics Stellar evolution Stellar abundances |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/abd557 |
| 英文摘要 | Abstract Since the discovery of chemically peculiar stars in globular clusters in the last century, the study of multiple populations has become increasingly important, given that chemical inhomogeneity is found in almost all globular clusters. Despite various proposed theories attempting to explain this phenomenon, fitting all the observational evidence in globular clusters with one single theory remains notoriously difficult and currently unsuccessful. In order to improve existing models and motivate new ones, we are observing globular clusters at critical conditions, e.g., metal-rich end, metal-poor end, and low mass end. In this paper, we present our first attempt to investigate multiple populations in low mass globular clusters. We obtained low-resolution spectra around 4000 ??of 30 members of the globular cluster Palomar 13 using OSIRIS/Multi-object spectrograph mounted at the Gran Telescopio Canarias. The membership of red giant branch stars is confirmed by the latest proper motions from Gaia DR2 and literature velocities. After comparing the measured CN and CH spectral indices with those of the stellar models, we found a clear sign of nitrogen variation among the red giant branch stars. Palomar 13 may be the lowest mass globular cluster showing multiple populations. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-908-2-ABD557 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/60620]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Tang,Baitian |
| 作者单位 | 1.Key Lab of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Beijing 100101, People's Republic of China 2.School of Physics and Astronomy, Sun Yat-sen University, Zhuhai 519082, People's Republic of China; tangbt@mail.sysu.edu.cn 3.Instituto de Astrofísica de Canarias, Vía Láctea s/n, E-38200, La Laguna, Tenerife, Spain 4.GRANTECAN, Cuesta de San José s/n, E-38712 , Bre?a Baja, La Palma, Spain 5.Institut Utinam, CNRS UMR 6213, Université Bourgogne-Franche-Comté, OSU THETA Franche-Comté, Observatoire de Besan?on, BP 1615, 25010 Besan?on Cedex, France 6.Instituto de Astronomía y Ciencias Planetarias, Universidad de Atacama, Copayapu 485, Copiapó, Chile 7.Instituto de Alta Investigación, Sede Esmeralda, Universidad de Tarapacá, Av. Luis Emilio Recabarren 2477, Iquique, Chile 8.Departamento de Astronomía, Facultad de Ciencias, Universidad de La Serena. Av. Juan Cisternas 1200, La Serena, Chile 9.Instituto de Investigación Multidisciplinario en Ciencia y Tecnología, Universidad de La Serena. Avenida Raúl Bitrán S/N, La Serena, Chile 10.Departamento de Astronomía, Casilla 160-C, Universidad de Concepción, Concepción, Chile |
| 推荐引用方式 GB/T 7714 | Tang,Baitian,Wang,Yue,Huang,Ruoyun,et al. Multiple Populations in Low-mass Globular Clusters: Palomar 13[J]. The Astrophysical Journal,2021,908(2). |
| APA | Tang,Baitian.,Wang,Yue.,Huang,Ruoyun.,Li,Chengyuan.,Yu,Jincheng.,...&Cabrera-Lavers,Antonio.(2021).Multiple Populations in Low-mass Globular Clusters: Palomar 13.The Astrophysical Journal,908(2). |
| MLA | Tang,Baitian,et al."Multiple Populations in Low-mass Globular Clusters: Palomar 13".The Astrophysical Journal 908.2(2021). |
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来源：国家天文台
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