The effect of metallicity on the minimum mass ratio of W Ursae Majoris-type systems
文献类型：期刊论文
| 作者 | Jiang DK(姜登凯)1,2,3 ; Han ZW(韩占文)1,2; Liu C(刘成)1,2,3; Wang JC(王建成)1,2; Li LF(李立芳)1,2
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| 刊名 | ASTROPHYSICS AND SPACE SCIENCE
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| 出版日期 | 2010-10 |
| 卷号 | 329期号:1-2页码:283-286 |
| 关键词 | Instabilities Binaries: close Blue stragglers Stars: evolution |
| ISSN号 | 0004-640X |
| 产权排序 | 第一完成单位 |
| 通讯作者 | Jiang, DK (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China. |
| 英文摘要 | According to the prevenient theoretical study, the minimum mass ratio for tidal stability of W Ursae Majoris (W UMa) systems is q(min) =(M(2)/M (1))similar to 0.071-0.078. However, the mass ratios of some observed W UMa binaries are smaller than the theoretical minimum mass ratio. Using Eggleton's stellar evolution code, we study the effects of metallicity and evolution on the minimum mass ratio of W UMa systems (M(1)=1.2M(circle dot)). We assume that k(1)(2) = k(2)(2) for the component's dimensionless gyration radii and that the contact degree is about 70 per cent. We find that the dynamical stability of W UMa binaries depends on the metallicity of W UMa systems. For the W UMa systems at age = 0 Gyr, the distribution of the minimum mass ratio has a fairly wide range, from 0.083 to 0.064, with the metallicity range from Z=0.0001 to 0.03. W UMa systems with Z=0.01 have the smallest value of the minimum mass ratio, which is about 0.064. The existence of low-q systems can be explained partly by the dependence of the dimensionless gyration radius on the metallicity. In addition, the dependence of the minimum mass ratio on the evolution, as suggested by previously work, is confirmed. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | CONTACT BINARIES ; STELLAR EVOLUTION ; ANGULAR-MOMENTUM ; BLUE STRAGGLERS ; STARS ; UMA ; STABILITY ; CLUSTERS |
| 收录类别 | SCI |
| 原文出处 | http://link.springer.com/article/10.1007%2Fs10509-010-0279-0 |
| 语种 | 英语 |
| WOS记录号 | WOS:000282823200046 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/4492]  |
| 专题 | 云南天文台_大样本恒星演化研究组 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.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming, 650011, P.R. China 2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, 650011, P.R. China 3.Graduate University of Chinese Academy of Sciences, Beijing, 100039, China |
| 推荐引用方式 GB/T 7714 | Jiang DK,Han ZW,Liu C,et al. The effect of metallicity on the minimum mass ratio of W Ursae Majoris-type systems[J]. ASTROPHYSICS AND SPACE SCIENCE,2010,329(1-2):283-286. |
| APA | Jiang DK,Han ZW,Liu C,Wang JC,&Li LF.(2010).The effect of metallicity on the minimum mass ratio of W Ursae Majoris-type systems.ASTROPHYSICS AND SPACE SCIENCE,329(1-2),283-286. |
| MLA | Jiang DK,et al."The effect of metallicity on the minimum mass ratio of W Ursae Majoris-type systems".ASTROPHYSICS AND SPACE SCIENCE 329.1-2(2010):283-286. |
入库方式： OAI收割
来源：云南天文台
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