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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
Source PublicationASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2016-07-01
Volume225Issue:1
DOI10.3847/0067-0049/225/1/7
Indexed BySCI
KeywordGalaxies: Star Clusters: General Hertzsprung-russell And C-m Diagrams Stars: Evolution
Abstract

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.

Funding ProjectChinese National Science Foundation[11203005] ; Chinese National Science Foundation[11563002] ; Chinese National Science Foundation[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
Funding OrganizationChinese 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
Language英语
Subject Area天文学 ; 恒星与银河系
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0067-0049
URL查看原文
WOS IDWOS:000382309000007
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordLARGE-MAGELLANIC-CLOUD ; A-TYPE STARS ; M-CIRCLE-DOT ; POPULATION PARAMETERS ; MULTIPLE POPULATIONS ; GLOBULAR-CLUSTERS ; RED CLUMP ; I. MODELS ; EVOLUTION ; DISTRIBUTIONS
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Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/9758
Collection中国科学院天体结构与演化重点实验室
Corresponding AuthorLi, Zhongmu
Affiliation1.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
Recommended Citation
GB/T 7714
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.(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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