The tight subgiant branch of the intermediate-age star cluster NGC 411 implies a single-aged stellar population
文献类型：期刊论文
| 作者 | Li, C.1,2,3,4,5; de Grijs, R.1,5,11; Bastian, N.10; Deng, L.4; Niederhofer, F.7,8,9; Zhang, C.6 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2016-09-21 |
| 卷号 | 461期号:3页码:3212-3221 |
| 关键词 | Stars: Rotation Galaxies: Clusters: Individual: Ngc 411 |
| ISSN号 | 0035-8711 |
| DOI | 10.1093/mnras/stw1491 |
| 英文摘要 | The presence of extended main-sequence turn-off (eMSTO) regions in intermediate-age star clusters in the Large and Small Magellanic Clouds is often interpreted as resulting from extended star formation histories (SFHs), lasting >= 300 Myr. This strongly conflicts with the traditional view of the dominant star formation mode in stellar clusters, which are thought of as single-aged stellar populations. Here we present a test of this interpretation by exploring the morphology of the subgiant branch (SGB) of NGC 411, which hosts possibly the most extended eMSTO among all known intermediate-age star clusters. We show that the width of the NGC 411 SGB favours the single-aged stellar population interpretation and rules out an extended SFH. In addition, when considering the red clump (RC) morphology and adopting the unproven premise that the widths of all features in the colour-magnitude diagram are determined by an underlying range in ages, we find that the SFH implied is still very close to that resulting from a single-aged stellar population, with a minor fraction of stars scattering to younger ages compared with the bulk of the population. The SFHs derived from the SGB and RC are both inconsistent with the SFH derived from the eMSTO region. NGC 411 has a very low escape velocity and it has unlikely undergone significant mass-loss at an early stage, thus indicating that it may lack the capacity to capture most of its initial, expelled gas from stellar evolutionary processes, a condition often required for extended SFHs to take root. |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000383481100067 |
| 出版者 | OXFORD UNIV PRESS |
| 源URL | [http://119.78.226.72/handle/331011/32771]  |
| 专题 | 中国科学院上海天文台 |
| 通讯作者 | Li, C. |
| 作者单位 | 1.Peking Univ, Dept Astron, Yi He Yuan Lu 5, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China 3.Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia 4.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, 20A Datun Rd, Beijing 100012, Peoples R China 5.Peking Univ, Kavli Inst Astron & Astrophys, Yi He Yuan Lu 5, Beijing 100871, Peoples R China 6.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 7.Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA 8.Univ Sternwarte Munchen, Scheinerstr 1, D-81679 Munich, Germany 9.Excellence Cluster Origin & Struct Universe, Boltzmannstr 2, D-85748 Garching, Germany 10.Liverpool John Moores Univ, Astrophys Res Inst, 146 Brownlow Hill, Liverpool L3 5RF, Merseyside, England |
| 推荐引用方式 GB/T 7714 | Li, C.,de Grijs, R.,Bastian, N.,et al. The tight subgiant branch of the intermediate-age star cluster NGC 411 implies a single-aged stellar population[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,461(3):3212-3221. |
| APA | Li, C.,de Grijs, R.,Bastian, N.,Deng, L.,Niederhofer, F.,&Zhang, C..(2016).The tight subgiant branch of the intermediate-age star cluster NGC 411 implies a single-aged stellar population.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,461(3),3212-3221. |
| MLA | Li, C.,et al."The tight subgiant branch of the intermediate-age star cluster NGC 411 implies a single-aged stellar population".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 461.3(2016):3212-3221. |
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来源：上海天文台
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