Extended Main-sequence Turnoffs in the Double Cluster h and chi Persei: The Complex Role of Stellar Rotation
文献类型：期刊论文
| 作者 | Li, Chengyuan1,2,3; Sun, Weijia4,5; de Grijs, Richard1,2,6; Deng, Licai3,7; Wang, Kun7,8; Cordoni, Giacomo9; Milone, Antonino P.9 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2019-05-01 |
| 卷号 | 876期号:1页码:11 |
| 关键词 | Hertzsprung-Russell and C-M diagrams open clusters and associations: individual (NGC 869 and NGC 884) |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab15d2 |
| 英文摘要 | Using Gaia Data Release 2 photometry, we report the detection of extended main-sequence turnoff (eMSTO) regions in the color-magnitude diagrams (CMDs) of the similar to 14 Myr old double clusters h and chi Persei (NGC 869 and NGC 884). We find that stars with masses below similar to 1.3 M-circle dot in both h and chi Persei populate narrow main sequences (MSs), while more massive stars define the eMSTO, closely mimicking observations of young Galactic and Magellanic Cloud clusters (with ages older than similar to 30 Myr). Previous studies based on clusters older than similar to 30 Myr found that rapidly rotating MS stars are redder than slow rotators of similar luminosity, suggesting that stellar rotation may be the main driver of the eMSTO. By combining photometry and projected rotational velocities from the literature of stars in h and chi Persei, we find no obvious relation between the rotational velocities and colors of non-emission-line eMSTO stars, in contrast with what is observed in older clusters. Similar to what is observed in Magellanic Cloud clusters, most of the extremely rapidly rotating stars, identified by their strong Ha emission lines, are located in the red part of the eMSTOs. This indicates that stellar rotation plays a role in the color and magnitude distribution of MSTO stars. By comparing the observations with simulated CMDs, we find that a simple population composed of coeval stars that span a wide range of rotation rates is unable to reproduce the color spread of the cluster's MSs. We suggest that variable stars, binary interactions, and stellar rotation affect the eMSTO morphology of these very young clusters. |
| WOS关键词 | MAGELLANIC CLOUD CLUSTERS ; POPULATIONS ; STARS ; EVOLUTION ; MASS ; I. |
| 资助项目 | Macquarie Research Fellowship Scheme ; National Key Research and Development Program of China[2017YFA0402702] ; National Natural Science Foundation of China[11633005] ; National Natural Science Foundation of China[11373010] ; National Natural Science Foundation of China[11473037] ; National Natural Science Foundation of China[11803048] ; China Scholarship Council ; European Research Council (ERC) under the European Union's Horizon 2020 research innovation programme[716082] ; MIUR through the the FARE project[R164RM93XW] ; Gaia Multilateral Agreement |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000467111100004 |
| 出版者 | IOP PUBLISHING LTD |
| 资助机构 | Macquarie Research Fellowship Scheme ; Macquarie Research Fellowship Scheme ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; European Research Council (ERC) under the European Union's Horizon 2020 research innovation programme ; European Research Council (ERC) under the European Union's Horizon 2020 research innovation programme ; MIUR through the the FARE project ; MIUR through the the FARE project ; Gaia Multilateral Agreement ; Gaia Multilateral Agreement ; Macquarie Research Fellowship Scheme ; Macquarie Research Fellowship Scheme ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; European Research Council (ERC) under the European Union's Horizon 2020 research innovation programme ; European Research Council (ERC) under the European Union's Horizon 2020 research innovation programme ; MIUR through the the FARE project ; MIUR through the the FARE project ; Gaia Multilateral Agreement ; Gaia Multilateral Agreement ; Macquarie Research Fellowship Scheme ; Macquarie Research Fellowship Scheme ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; European Research Council (ERC) under the European Union's Horizon 2020 research innovation programme ; European Research Council (ERC) under the European Union's Horizon 2020 research innovation programme ; MIUR through the the FARE project ; MIUR through the the FARE project ; Gaia Multilateral Agreement ; Gaia Multilateral Agreement ; Macquarie Research Fellowship Scheme ; Macquarie Research Fellowship Scheme ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; European Research Council (ERC) under the European Union's Horizon 2020 research innovation programme ; European Research Council (ERC) under the European Union's Horizon 2020 research innovation programme ; MIUR through the the FARE project ; MIUR through the the FARE project ; Gaia Multilateral Agreement ; Gaia Multilateral Agreement |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/26162]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Li, Chengyuan |
| 作者单位 | 1.Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia 2.Macquarie Univ, Ctr Astron Astrophys & Astrophoton, Sydney, NSW 2109, Australia 3.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, 20A Datun Rd, Beijing 100012, Peoples R China 4.Peking Univ, Dept Astron, Yi He Yuan Lu 5, Beijing 100871, Peoples R China 5.Peking Univ, Kavli Inst Astron & Astrophys, Yi He Yuan Lu 5, Beijing 100871, Peoples R China 6.Int Space Sci Inst Beijing, 1 Nanertiao, Beijing 100190, Peoples R China 7.China West Normal Univ, Dept Astron, Nanchong 637002, Peoples R China 8.Inst Astrofis Canarias, E-38200 Tenerife, Spain 9.Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Vicolo Osservatorio 3, I-35122 Padua, Italy |
| 推荐引用方式 GB/T 7714 | Li, Chengyuan,Sun, Weijia,de Grijs, Richard,et al. Extended Main-sequence Turnoffs in the Double Cluster h and chi Persei: The Complex Role of Stellar Rotation[J]. ASTROPHYSICAL JOURNAL,2019,876(1):11. |
| APA | Li, Chengyuan.,Sun, Weijia.,de Grijs, Richard.,Deng, Licai.,Wang, Kun.,...&Milone, Antonino P..(2019).Extended Main-sequence Turnoffs in the Double Cluster h and chi Persei: The Complex Role of Stellar Rotation.ASTROPHYSICAL JOURNAL,876(1),11. |
| MLA | Li, Chengyuan,et al."Extended Main-sequence Turnoffs in the Double Cluster h and chi Persei: The Complex Role of Stellar Rotation".ASTROPHYSICAL JOURNAL 876.1(2019):11. |
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来源：国家天文台
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