A SYSTEMATIC STUDY OF EFFECTS OF STELLAR ROTATION, AGE SPREAD, AND BINARIES ON COLOR-MAGNITUDE DIAGRAMS WITH EXTENDED MAIN-SEQUENCE TURNOFFS
Li, Zhongmu1,2; Mao, Caiyan1; Zhang, Liyun3; Zhang, Xi1; Chen, Li1; Li, ZM
发表期刊ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2016-07-01
卷号225期号:1
DOI10.3847/0067-0049/225/1/7
收录类别SCI
关键词Galaxies: Star Clusters: General Hertzsprung-russell And C-m Diagrams Stars: Evolution
摘要Stellar rotation, age spread, and binary stars are thought to be the three most possible causes of the peculiar color-magnitude diagrams (CMDs) of some star clusters, which exhibit extended main-sequence turnoffs (eMSTOs). The answer is far from clear. This paper studies the effects of the three above causes on the CMDs of star clusters systematically. A rapid stellar evolutionary code and a recently published database of rotational effects of single stars have been used, via an advanced stellar population synthesis technique. As a result, we find a similar result for rotation to recent works, which suggests that rotation is able to explain, at least partially, the eMSTOs of clusters, if clusters are not too old (<2.0 Gyr). In addition, an age spread of 200-500 Myr reproduces extended turnoffs for all clusters younger than 2.5 Gyr, in particular, for those younger than 2.2 Gyr. Age spread also results in extended red clumps (eRCs) for clusters younger than 0.5 Gyr. The younger the clusters, the clearer the eRC structures. Moreover, it is shown that binaries (including interactive binaries) affect the spread of MSTOs slightly for old clusters, but they can contribute to the eMSTOs of clusters younger than 0.5 Gyr. Our result suggests a possible way to disentangle the roles of stellar rotation and age spread, i.e., checking the existence of CMDs with both eMSTOs and eRCs in clusters younger than 0.5 Gyr.
项目资助者Chinese National Science Foundation(11203005, 11563002, U1431114) ; open projects of Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences ; Key Laboratory of Semianalytical Systems of Galaxies and Cosmology, Shanghai
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0067-0049
URL查看原文
WOS记录号WOS:000382309000007
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]LARGE-MAGELLANIC-CLOUD ; A-TYPE STARS ; M-CIRCLE-DOT ; POPULATION PARAMETERS ; MULTIPLE POPULATIONS ; GLOBULAR-CLUSTERS ; RED CLUMP ; I. MODELS ; EVOLUTION ; DISTRIBUTIONS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9758
专题中国科学院天体结构与演化重点实验室
通讯作者Li, ZM
作者单位1.Institute for Astronomy and History of Science and Technology, Dali University, Dali 671003, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
3.College of Science/Department of Physics & NAOC-GZU-Sponsored Center for Astronomy Research, Guizhou University, Guiyang 550025, China
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Li, Zhongmu,Mao, Caiyan,Zhang, Liyun,et al. A SYSTEMATIC STUDY OF EFFECTS OF STELLAR ROTATION, AGE SPREAD, AND BINARIES ON COLOR-MAGNITUDE DIAGRAMS WITH EXTENDED MAIN-SEQUENCE TURNOFFS[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2016,225(1).
APA Li, Zhongmu,Mao, Caiyan,Zhang, Liyun,Zhang, Xi,Chen, Li,&Li, ZM.(2016).A SYSTEMATIC STUDY OF EFFECTS OF STELLAR ROTATION, AGE SPREAD, AND BINARIES ON COLOR-MAGNITUDE DIAGRAMS WITH EXTENDED MAIN-SEQUENCE TURNOFFS.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,225(1).
MLA Li, Zhongmu,et al."A SYSTEMATIC STUDY OF EFFECTS OF STELLAR ROTATION, AGE SPREAD, AND BINARIES ON COLOR-MAGNITUDE DIAGRAMS WITH EXTENDED MAIN-SEQUENCE TURNOFFS".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 225.1(2016).
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