| Hot subdwarfs from the stable Roche lobe overflow channel | |
Yu SH(禹升华)1,2 ; Li LF(李立芳)2; Yu, S (reprint author), Armagh Observ, Coll Hill, Armagh BT61 9DG, North Ireland.
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| 发表期刊 | ASTRONOMY & ASTROPHYSICS
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| 2009-08 | |
| 卷号 | 503期号:1页码:151-163 |
| DOI | 10.1051/0004-6361/200809454 |
| 产权排序 | 第1完成单位 |
| 收录类别 | SCI ; EI |
| 关键词 | Stars: Subdwarfs Stars: Horizontal-branch Stars: Evolution Stars: Formation |
| 摘要 | Context. Hot subdwarfs are core-helium-burning stars with extremely thin envelopes. We discuss the formation and evolution of hot subdwarfs formed through the stable Roche lobe overflow (RLOF) channel of intermediate-mass binaries, although their formation channels are various. Aims. In this study, we concentrate on the formation and evolution of hot subdwarfs binaries through the stable RLOF channel of intermediate-mass binaries. We aim at setting out the properties of hot subdwarfs and their progenitors, so that we can understand the formation and evolution of hot subdwarfs. Methods. Employing Eggleton's stellar evolution code, we have computed conservative and nonconservative population I binary evolution sequences. The initial mass of the primary ranges from 2.2 to 6.3 M(circle dot), spaced by approximately 0.1 in log M, the initial mass ratio q(i) = M(1)/M(2) is between 1.1 and 4.5, and the Roche lobe overflow begins at the main sequence, the Hertzsprung gap and the first giant branch. In nonconservative binary evolution, we assume that 50 percent of the mass lost from the primary leaves the system, carrying away the specific angular momentum of the primary, and the remaining mass is accreted on to the secondary during the RLOF. Also, we have studied the distributions of the mass and orbital periods of hot subdwarfs using the population synthesis approach. Results. We have obtained the ranges of the initial parameters of progenitor binaries and the properties of hot subdwarfs through the stable RLOF channel of intermediate-mass binaries, e. g. mass, envelope mass and age of hot subdwarfs. We have found that hot subdwarfs could be formed through stable Roche lobe overflow at the main sequence and Hertzsprung gap. We have also found that some subdwarf B or OB stars have anomalously high mass (similar to 1 M(circle dot)) with a thick envelope (similar to 0.07 M(circle dot)-similar to 0.16) in our models. By comparing our theoretical results with observations on the hot subdwarfs in open clusters, we suggest that more hot subdwarfs in binary systems might be found in open clusters in the future. |
| 语种 | 英语 |
| 学科领域 | Astronomy & Astrophysics |
| 文章类型 | Article |
| ISSN | 0004-6361 |
| URL | 查看原文 |
| WOS记录号 | WOS:000269150300018 |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 关键词[WOS] | LARGE-MAGELLANIC-CLOUD ; HORIZONTAL-BRANCH STARS ; CLOSE BINARY EVOLUTION ; INITIAL MASS FUNCTION ; LINED ECLIPSING BINARIES ; ASYMPTOTIC GIANT BRANCH ; LUMINOUS WHITE-DWARF ; NEUTRINO ENERGY-LOSS ; IA PROGENITOR SURVEY ; FAINT BLUE STARS |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/4470 |
| 专题 | 大样本恒星演化研究组 |
| 通讯作者 | Yu, S (reprint author), Armagh Observ, Coll Hill, Armagh BT61 9DG, North Ireland. |
| 作者单位 | 1.Armagh Observatory, College Hill, Armagh BT61 9DG, Northern Ireland, UK 2.National Astronomical Observatories Yunnan Observatory, the Chinese Academy of Sciences, PO Box 110, Kunming 650011, PR China |
| 第一作者单位 | 中国科学院云南天文台 |
| 推荐引用方式 GB/T 7714 | Yu SH,Li LF,Yu, S . Hot subdwarfs from the stable Roche lobe overflow channel[J]. ASTRONOMY & ASTROPHYSICS,2009,503(1):151-163. |
| APA | Yu SH,Li LF,&Yu, S .(2009).Hot subdwarfs from the stable Roche lobe overflow channel.ASTRONOMY & ASTROPHYSICS,503(1),151-163. |
| MLA | Yu SH,et al."Hot subdwarfs from the stable Roche lobe overflow channel".ASTRONOMY & ASTROPHYSICS 503.1(2009):151-163. |
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| Hot subdwarfs from t（590KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | 浏览 请求全文 | |
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