THE VMC SURVEY. XI. RADIAL STELLAR POPULATION GRADIENTS IN THE GALACTIC GLOBULAR CLUSTER 47 TUCANAE
文献类型：期刊论文
| 作者 | Li, Chengyuan1,2,3; de Grijs, Richard1,2; Deng, Licai3 ; Rubele, Stefano4; Wang, Chuchu2; Bekki, Kenji5; Cioni, Maria-Rosa L.6,7; Clementini, Gisella8; Emerson, Jim9; For, Bi-Qing5
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2014-07-20 |
| 卷号 | 790期号:1 |
| 关键词 | globular clusters: individual (47 Tuc, NGC 104) Hertzsprung-Russell and C-M diagrams infrared: stars stars: Population II |
| 英文摘要 | We present a deep near-infrared color-magnitude diagram of the Galactic globular cluster 47 Tucanae, obtained with the Visible and Infrared Survey Telescope for Astronomy (VISTA) as part of the VISTA near-infrared Y, J, K-s survey of the Magellanic System (VMC). The cluster stars comprising both the subgiant and red giant branches exhibit apparent, continuous variations in color-magnitude space as a function of radius. Subgiant branch stars at larger radii are systematically brighter than their counterparts closer to the cluster core; similarly, red-giant-branch stars in the cluster's periphery are bluer than their more centrally located cousins. The observations can very well be described by adopting an age spread of similar to 0.5 Gyr as well as radial gradients in both the cluster's helium abundance (Y) and metallicity (Z), which change gradually from (Y = 0.28, Z = 0.005) in the cluster core to (Y = 0.25, Z = 0.003) in its periphery. We conclude that the cluster's inner regions host a significant fraction of second-generation stars, which decreases with increasing radius; the stellar population in the 47 Tuc periphery is well approximated by a simple stellar population. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000338836800035 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6570]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 2.Peking Univ, Dept Astron, Beijing 100871, Peoples R China 3.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China 4.INAF Osservatorio Astron Padova, I-35122 Padua, Italy 5.Univ Western Australia, ICRAR M468, Crawley, WA 6009, Australia 6.Univ Hertfordshire, Dept Phys Astron & Math, Hatfield AL10 9AB, Herts, England 7.Leibnitz Inst Astrophys Potsdam, D-14482 Potsdam, Germany 8.INAF Osservatorio Astron Bologna, I-40127 Bologna, Italy 9.Queen Mary Univ London, Sch Phys & Astron, Astron Unit, London E1 4NS, England 10.Royal Observ Belgium, B-1180 Uccle, Belgium |
| 推荐引用方式 GB/T 7714 | Li, Chengyuan,de Grijs, Richard,Deng, Licai,et al. THE VMC SURVEY. XI. RADIAL STELLAR POPULATION GRADIENTS IN THE GALACTIC GLOBULAR CLUSTER 47 TUCANAE[J]. ASTROPHYSICAL JOURNAL,2014,790(1). |
| APA | Li, Chengyuan.,de Grijs, Richard.,Deng, Licai.,Rubele, Stefano.,Wang, Chuchu.,...&van Loon, Jacco Th..(2014).THE VMC SURVEY. XI. RADIAL STELLAR POPULATION GRADIENTS IN THE GALACTIC GLOBULAR CLUSTER 47 TUCANAE.ASTROPHYSICAL JOURNAL,790(1). |
| MLA | Li, Chengyuan,et al."THE VMC SURVEY. XI. RADIAL STELLAR POPULATION GRADIENTS IN THE GALACTIC GLOBULAR CLUSTER 47 TUCANAE".ASTROPHYSICAL JOURNAL 790.1(2014). |
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来源：国家天文台
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