Multiple Stellar Populations at Less Evolved Stages. III. A Possible Helium Spread in NGC 2210
文献类型:期刊论文
作者 | Li, Chengyuan7,9; Ji, Xin2,4; Wang, Long7,9; Wang, Yue2; Tang, Baitian7,9; Milone, Antonino P.5,6; Yang, Yujiao3; Baumgardt, Holger1; Jiang DK(姜登凯)8 |
刊名 | ASTROPHYSICAL JOURNAL |
出版日期 | 2023-05-01 |
卷号 | 948期号:1 |
ISSN号 | 0004-637X |
DOI | 10.3847/1538-4357/acbd99 |
产权排序 | 第9完成单位 |
文献子类 | Article |
英文摘要 | Helium variations are common features of globular clusters (GCs) with multiple stellar populations. All the formation scenarios predict that secondary population stars are enhanced in helium, but the exact helium content depends on the polluters. Therefore, searching for helium variations in a star cluster is a straightforward method to understand whether it hosts multiple populations or not and to constrain the formation scenario. Although this topic has been well explored for Galactic GCs, GCs beyond the Milky Way are challenging to study because of their large distances. This work studies the helium distribution of GK-type main-sequence (MS) dwarfs in an old (similar to 12.5 Gyr) GC in the Large Magellanic Cloud, NGC 2210, using the deep photometry observed by the Hubble Space Telescope. We compare the observed morphology of the MS with that of synthetic populations with different helium distributions. We confirm that NGC 2210 dwarfs have a helium spread, with an internal dispersion of delta Y similar to 0.06-0.07. The fraction of helium-enriched stars depends on the delta Y distribution. A continuous delta Y distribution would indicate that more than half of MS stars are helium enriched (similar to 55%). If the delta Y distribution is discrete (bimodal), a fraction of similar to 30% enriched stars is able to explain the observed morphology of the MS. We also find that the He-enriched population stars are more centrally concentrated than He-normal stars. |
学科主题 | 天文学 ; 恒星与银河系 ; 恒星形成与演化 |
URL标识 | 查看原文 |
出版地 | TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND |
WOS关键词 | GALACTIC GLOBULAR-CLUSTERS ; LARGE-MAGELLANIC-CLOUD ; RED GIANT BRANCH ; UV LEGACY SURVEY ; HORIZONTAL-BRANCH ; STAR-CLUSTERS ; DYNAMICAL EVOLUTION ; SELF-ENRICHMENT ; MAIN-SEQUENCE ; MASS-LOSS |
资助项目 | National Key R&D Program of China[2021YFA1600403] ; National Key R&D Program of China[12233013] ; National Natural Science Foundation of China[U1931102] ; National Natural Science Foundation of China[2020YFC2201400] ; National Natural Science Foundation of China[12073070] ; National Natural Science Foundation of China[11733008] ; National Natural Science Foundation of China[12073090] ; Natural Science Foundation of Guangdong Province[2022A1515010732] ; China Manned Space Project[CMS-CSST-2021-A08] ; China Manned Space Project[CMS-CSST-2021-B03] ; CAS Light of West China Program ; Special Research Assistant Foundation Project of Chinese Academy of Sciences ; one-hundred-talent project of Sun Yat-sen University |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | IOP Publishing Ltd |
WOS记录号 | WOS:000978035300001 |
资助机构 | National Key R&D Program of China[2021YFA1600403, 12233013] ; National Natural Science Foundation of China[U1931102, 2020YFC2201400, 12073070, 11733008, 12073090] ; Natural Science Foundation of Guangdong Province[2022A1515010732] ; China Manned Space Project[CMS-CSST-2021-A08, CMS-CSST-2021-B03] ; CAS Light of West China Program ; Special Research Assistant Foundation Project of Chinese Academy of Sciences ; one-hundred-talent project of Sun Yat-sen University |
版本 | 出版稿 |
源URL | [http://ir.ynao.ac.cn/handle/114a53/26033] |
专题 | 云南天文台_大样本恒星演化研究组 |
通讯作者 | Li, Chengyuan |
作者单位 | 1.School of Mathematics and Physics, The University of Queensland, St. Lucia, QLD 4072, Australia; 2.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China; 3.Key Laboratory of Space Astronomy and Technology, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China; 4.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China; 5.Dipartimento di Fisica e Astronomia 6.Istituto Nazionale di Astrofisica—Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, Padova, I-35122, Italy; 7.CSST Science Center for the Guangdong-Hong Kong-Macau Greater Bay Area, Zhuhai 519082, People's Republic of China; 8.Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming 650216, People's Republic of China 9.School of Physics and Astronomy, Sun Yat-sen University, Daxue Road, Zhuhai 519082, People's Republic of China; lichengy5@mail.sysu.edu.cn; |
推荐引用方式 GB/T 7714 | Li, Chengyuan,Ji, Xin,Wang, Long,et al. Multiple Stellar Populations at Less Evolved Stages. III. A Possible Helium Spread in NGC 2210[J]. ASTROPHYSICAL JOURNAL,2023,948(1). |
APA | Li, Chengyuan.,Ji, Xin.,Wang, Long.,Wang, Yue.,Tang, Baitian.,...&Jiang DK.(2023).Multiple Stellar Populations at Less Evolved Stages. III. A Possible Helium Spread in NGC 2210.ASTROPHYSICAL JOURNAL,948(1). |
MLA | Li, Chengyuan,et al."Multiple Stellar Populations at Less Evolved Stages. III. A Possible Helium Spread in NGC 2210".ASTROPHYSICAL JOURNAL 948.1(2023). |
入库方式: OAI收割
来源:云南天文台
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