EXPLANATION OF A SPECIAL COLOR-MAGNITUDE DIAGRAM OF STAR CLUSTER NGC 1651 FROM DIFFERENT MODELS
文献类型：期刊论文
| 作者 | Li, Zhongmu1,2 ; Mao, Caiyan1; Chen, Li1
|
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2015-03-20 |
| 卷号 | 802期号:1 |
| 关键词 | globular clusters: general Hertzsprung-Russell and C-M diagrams stars: evolution |
| ISSN号 | 0004-637X |
| 通讯作者 | Li, ZM (zhongmu.li@gmail.com), Institute for Astronomy and History of Science and Technology, Dali University, Dali 671003, China |
| 英文摘要 | 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. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | 天文学 |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | 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 |
| 收录类别 | SCI |
| 原文出处 | http://iopscience.iop.org/article/10.1088/0004-637X/802/1/44/meta |
| 语种 | 英语 |
| WOS记录号 | WOS:000351834700044 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/7560]  |
| 专题 | 云南天文台_中国科学院天体结构与演化重点实验室 |
| 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 |
| 推荐引用方式 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). |
入库方式： OAI收割
来源：云南天文台
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