GRAVITATIONAL CONUNDRUM? DYNAMICAL MASS SEGREGATION VERSUS DISRUPTION OF BINARY STARS IN DENSE STELLAR SYSTEMS
文献类型：期刊论文
| 作者 | de Grijs, Richard1,2; Li, Chengyuan1,3; Zheng, Yong1,3; Deng, Licai4,5 ; Hu, Yi4; Kouwenhoven, M. B. N.1; Wicker, James E.4
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2013-03-01 |
| 卷号 | 765期号:1 |
| 关键词 | binaries: general galaxies: star clusters: individual (NGC 1818) Hertzsprung-Russell and C-M diagrams Magellanic Clouds stars: kinematics and dynamics |
| 英文摘要 | Upon their formation, dynamically cool (collapsing) star clusters will, within only a few million years, achieve stellar mass segregation for stars down to a few solar masses, simply because of gravitational two-body encounters. Since binary systems are, on average, more massive than single stars, one would expect them to also rapidly mass segregate dynamically. Contrary to these expectations and based on high-resolution Hubble Space Telescope observations, we show that the compact, 15-30 Myr old Large Magellanic Cloud cluster NGC 1818 exhibits tantalizing hints at the >= 2 sigma level of significance (> 3 sigma if we assume a power-law secondary-to-primary mass-ratio distribution) of an increasing fraction of F-star binary systems (with combined masses of 1.3-1.6M(circle dot)) with increasing distance from the cluster center, specifically between the inner 10 ''-20 '' (approximately equivalent to the cluster's core and half-mass radii) and the outer 60 ''-80 ''. If confirmed, then this will offer support for the theoretically predicted but thus far unobserved dynamical disruption processes of the significant population of "soft" binary systems-with relatively low binding energies compared to the kinetic energy of their stellar members-in star clusters, which we have access to here by virtue of the cluster's unique combination of youth and high stellar density. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000314957900004 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5887]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 2.Kyung Hee Univ, Dept Astron & Space Sci, Yongin 449701, Kyungki Do, South Korea 3.Peking Univ, Dept Astron, Beijing 100871, Peoples R China 4.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 5.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | de Grijs, Richard,Li, Chengyuan,Zheng, Yong,et al. GRAVITATIONAL CONUNDRUM? DYNAMICAL MASS SEGREGATION VERSUS DISRUPTION OF BINARY STARS IN DENSE STELLAR SYSTEMS[J]. ASTROPHYSICAL JOURNAL,2013,765(1). |
| APA | de Grijs, Richard.,Li, Chengyuan.,Zheng, Yong.,Deng, Licai.,Hu, Yi.,...&Wicker, James E..(2013).GRAVITATIONAL CONUNDRUM? DYNAMICAL MASS SEGREGATION VERSUS DISRUPTION OF BINARY STARS IN DENSE STELLAR SYSTEMS.ASTROPHYSICAL JOURNAL,765(1). |
| MLA | de Grijs, Richard,et al."GRAVITATIONAL CONUNDRUM? DYNAMICAL MASS SEGREGATION VERSUS DISRUPTION OF BINARY STARS IN DENSE STELLAR SYSTEMS".ASTROPHYSICAL JOURNAL 765.1(2013). |
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来源：国家天文台
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