Multiple Populations in Low-mass Globular Clusters: Palomar 13
Tang,Baitian1; Wang,Yue2; Huang,Ruoyun1; Li,Chengyuan1; Yu,Jincheng1; Geisler,Doug3,4,5; Dias,Bruno6; Fernández-Trincado,José G.7,8; Carballo-Bello,Julio A.6; Cabrera-Lavers,Antonio9,10
Source PublicationThe Astrophysical Journal
AbstractAbstract 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.
KeywordGlobular star clusters Stellar kinematics Stellar evolution Stellar abundances
WOS IDIOP:0004-637X-908-2-abd557
PublisherThe American Astronomical Society
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Document Type期刊论文
Corresponding AuthorTang,Baitian
Affiliation1.School of Physics and Astronomy, Sun Yat-sen University, Zhuhai 519082, People's Republic of China;
2.Key Lab of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Beijing 100101, People's Republic of China
3.Departamento de Astronomía, Casilla 160-C, Universidad de Concepción, Concepción, Chile
4.Instituto de Investigación Multidisciplinario en Ciencia y Tecnología, Universidad de La Serena. Avenida Raúl Bitrán S/N, La Serena, Chile
5.Departamento de Astronomía, Facultad de Ciencias, Universidad de La Serena. Av. Juan Cisternas 1200, La Serena, Chile
6.Instituto de Alta Investigación, Sede Esmeralda, Universidad de Tarapacá, Av. Luis Emilio Recabarren 2477, Iquique, Chile
7.Instituto de Astronomía y Ciencias Planetarias, Universidad de Atacama, Copayapu 485, Copiapó, Chile
8.Institut Utinam, CNRS UMR 6213, Université Bourgogne-Franche-Comté, OSU THETA Franche-Comté, Observatoire de Besan?on, BP 1615, 25010 Besan?on Cedex, France
9.GRANTECAN, Cuesta de San José s/n, E-38712 , Bre?a Baja, La Palma, Spain
10.Instituto de Astrofísica de Canarias, Vía Láctea s/n, E-38200, La Laguna, Tenerife, Spain
Recommended Citation
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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