EXPLANATION OF A SPECIAL COLOR-MAGNITUDE DIAGRAM OF STAR CLUSTER NGC 1651 FROM DIFFERENT MODELS
Li, Zhongmu1,2; Mao, Caiyan1; Chen, Li1; Li, ZM (zhongmu.li@gmail.com), Institute for Astronomy and History of Science and Technology, Dali University, Dali 671003, China
发表期刊ASTROPHYSICAL JOURNAL
2015-03-20
卷号802期号:1
DOI10.1088/0004-637X/802/1/44
收录类别SCI
关键词Globular Clusters: General Hertzsprung-russell And C-m Diagrams Stars: Evolution
摘要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.
项目资助者Chinese 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)
语种英语
学科领域天文学
文章类型Article
ISSN0004-637X
URL查看原文
WOS记录号WOS:000351834700044
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]LARGE-MAGELLANIC-CLOUD ; MAIN-SEQUENCE TURNOFF ; MULTIPLE STELLAR POPULATIONS ; A-TYPE STARS ; FORMATION HISTORY ; RED CLUMP ; ROTATIONAL VELOCITIES ; BINARY STARS ; AGE ; EVOLUTION
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被引频次:9[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/7560
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 (zhongmu.li@gmail.com), Institute for Astronomy and History of Science and Technology, Dali University, Dali 671003, China
作者单位1.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
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Li, Zhongmu,Mao, Caiyan,Chen, Li,et al. 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,&Li, ZM .(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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