The binary fraction of the young cluster ngc 1818 in the large magellanic cloud
文献类型：期刊论文
| 作者 | Hu, Y.1,2; Deng, L.1; de Grijs, Richard1,3,4; Liu, Q.1,2; Goodwin, Simon P.4 |
| 刊名 | Astrophysical journal
 |
| 出版日期 | 2010-11-20 |
| 卷号 | 724期号:1页码:649-656 |
| ISSN号 | 0004-637X |
| 关键词 | Binaries: general Galaxies: star clusters: general Magellanic clouds Methods: statistical |
| DOI | 10.1088/0004-637x/724/1/649 |
| 通讯作者 | Hu, y.(licai@bao.ac.cn) |
| 英文摘要 | We use high-resolution hubble space telescope imaging observations of the young (similar to 15-25 myr old) star cluster ngc 1818 in the large magellanic cloud to derive an estimate for the binary fraction of f stars (1.3 < m(star)/m(circle dot) < 1.6). this study provides the strongest constraints yet on the binary fraction in a young star cluster in a low-metallicity environment ([fe/h] similar to -0.4 dex). employing artificial-star tests, we develop a simple method that can efficiently measure the probabilities of stellar blends and superpositions from the observed stellar catalog. we create synthetic color-magnitude diagrams matching the fundamental parameters of ngc 1818, with different binary fractions and mass-ratio distributions. we find that this method is sensitive to binaries with mass ratios q greater than or similar to 0.4. for binaries with f-star primaries and mass ratios q > 0.4, the binary fraction is similar to 0.35. this suggests a total binary fraction for f stars of 0.55 to unity, depending on assumptions about the form of the mass-ratio distribution at low q. |
| WOS关键词 | INITIAL MASS FUNCTION ; SPACE-TELESCOPE WFPC2 ; COLOR-MAGNITUDE DIAGRAMS ; COMPACT STAR-CLUSTERS ; GLOBULAR-CLUSTER ; LUMINOSITY FUNCTIONS ; MAIN-SEQUENCE ; POPULATION ; MULTIPLICITY ; PHOTOMETRY |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000284096900055 |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2410012 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Hu, Y. |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100012, Peoples R China 3.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 4.Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England |
| 推荐引用方式 GB/T 7714 | Hu, Y.,Deng, L.,de Grijs, Richard,et al. The binary fraction of the young cluster ngc 1818 in the large magellanic cloud[J]. Astrophysical journal,2010,724(1):649-656. |
| APA | Hu, Y.,Deng, L.,de Grijs, Richard,Liu, Q.,&Goodwin, Simon P..(2010).The binary fraction of the young cluster ngc 1818 in the large magellanic cloud.Astrophysical journal,724(1),649-656. |
| MLA | Hu, Y.,et al."The binary fraction of the young cluster ngc 1818 in the large magellanic cloud".Astrophysical journal 724.1(2010):649-656. |
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来源：中国科学院大学
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