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EXPLANATION OF A SPECIAL COLOR-MAGNITUDE DIAGRAM OF STAR CLUSTER NGC 1651 FROM DIFFERENT MODELS
Li, Zhongmu1,2; Mao, Caiyan1; Chen, Li1
Source PublicationASTROPHYSICAL JOURNAL
2015-03-20
Volume802Issue:1
DOI10.1088/0004-637X/802/1/44
Indexed BySCI
KeywordGlobular Clusters: General Hertzsprung-russell And C-m Diagrams Stars: Evolution
Abstract

The color-magnitude diagram (CMD) of globular cluster NGC 1651 has special structures including a broad main sequence, an extended main sequence turn-off, and an extended red giant clump. The reason for such a special CMD. remains unclear. In order to test the difference among. the results from various stellar population assumptions, we study a high-quality CMD of NGC 1651 from the Hubble Space Telescope archive using eight kinds of models. Distance modulus, extinction, age ranges, star formation mode, fraction of binaries, and fraction of rotational stars are determined and then compared. The results show that stellar populations both with and without age spread can reproduce the special structure of the observed CMD. A composite population with extended star formation from 1.8 Gyrs ago to 1.4 Gyrs ago, which contains 50% binaries and 70% rotational stars, fits the observed CMD best. Meanwhile, a 1.5 Gyr-old simple population that consists of rotational stars can also fit the observed CMD well. The results of CMD fitting are shown to depend strongly on stellar population type (simple or composite), and fraction of rotators. If the member stars of NGC 1651 formed in a single star burst, the effect of stellar rotation should be very important for explaining the observed CMDs. Otherwise, the effect may be small. It is also possible that the special observed CMD is a result of the combined effects of stellar binarity, rotation, and age spread. Therefore, further work on stellar population type and fraction of rotational stars of intermediate-age clusters are necessary to understand their observed CMDs.

Funding ProjectChinese National Science Foundation[11203005] ; Open Project of Key Laboratory for the Structure and Evolution of Celestial Objects ; Chinese Academy of Sciences[OP201304] ; Foundation of Yunnan Education Department[2010Z004]
Funding OrganizationChinese National Science Foundation[11203005] ; Open Project of Key Laboratory for the Structure and Evolution of Celestial Objects ; Chinese Academy of Sciences[OP201304] ; Foundation of Yunnan Education Department[2010Z004]
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星形成与演化
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
WOS IDWOS:000351834700044
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordLARGE-MAGELLANIC-CLOUD ; MAIN-SEQUENCE TURNOFF ; MULTIPLE STELLAR POPULATIONS ; A-TYPE STARS ; FORMATION HISTORY ; RED CLUMP ; ROTATIONAL VELOCITIES ; BINARY STARS ; AGE ; EVOLUTION
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/7560
Collection中国科学院天体结构与演化重点实验室
Corresponding AuthorLi, Zhongmu
Affiliation1.Dali Univ, Inst Astron & Hist Sci & Technol, Dali 671003, Peoples R China
2.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 650011, Peoples R China
Recommended Citation
GB/T 7714
Li, Zhongmu,Mao, Caiyan,Chen, Li. EXPLANATION OF A SPECIAL COLOR-MAGNITUDE DIAGRAM OF STAR CLUSTER NGC 1651 FROM DIFFERENT MODELS[J]. ASTROPHYSICAL JOURNAL,2015,802(1).
APA Li, Zhongmu,Mao, Caiyan,&Chen, Li.(2015).EXPLANATION OF A SPECIAL COLOR-MAGNITUDE DIAGRAM OF STAR CLUSTER NGC 1651 FROM DIFFERENT MODELS.ASTROPHYSICAL JOURNAL,802(1).
MLA Li, Zhongmu,et al."EXPLANATION OF A SPECIAL COLOR-MAGNITUDE DIAGRAM OF STAR CLUSTER NGC 1651 FROM DIFFERENT MODELS".ASTROPHYSICAL JOURNAL 802.1(2015).
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