| MAGNETIC BRAKING AND THE EVOLUTION OF THE HW VIR-LIKE BINARY STARS | |
Qian SB(钱声帮)1,2,3 ; Dai ZB(戴智斌)1,2,3; Zhu LY(朱俐颖)1,2,3; Liu L(刘亮)1,2,3; He JJ(何家佳)1,2,3; Liao WP(廖文萍)1,2,3; Li LJ(李临甲)1,2,3; Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
| |
| 发表期刊 | ASTROPHYSICAL JOURNAL LETTERS
 |
| 2008-12-10 | |
| 卷号 | 689期号:1页码:L49-L52 |
| DOI | 10.1086/595727 |
| 产权排序 | 第1完成单位 |
| 收录类别 | SCI |
| 关键词 | Binaries: Close Binaries: Eclipsing Stars: Evolution Stars: Individual (Hw Vir) |
| 摘要 | HW Vir-like close binaries are thought to be the progenitors of cataclysmic variables. However, how this type of peculiar stars evolve into cataclysmic variables is an unsolved problem in astrophysics. Here we report the variations of the orbital period of HW Vir, the prototype of this group of systems. A long-term period decrease is discovered to be superimposed on the well-known cyclic change reported by previous investigators. It is suggested that the continuous decrease can be plausibly interpreted by angular momentum loss via magnetic braking of the completely convective star. This is driving the shrink of the orbit and will result in mass transfer between both components. We found that the binary will be undergoing mass transfer long before the sdB primary star evolves into a white dwarf. This conclusion suggests that HW Vir-like binaries do not directly evolve into cataclysmic variables through angular momentum loss as astronomers previously thought. On the other hand, if the observed period decrease is only part of a long-period cyclic variation, it may reveal the presence of another substellar companion in a wide orbit. This makes HW Vir an important system for future study of the formation and evolution of substellar objects. |
| 项目资助者 | Yunnan Natural Science Foundation(2005A0059M) ; Chinese Natural Science Foundation(10573032, 10433030) ; National Key Fundamental Research Project(2007CB815406) ; Chinese Academy of Sciences(O8ZKY11001) |
| 语种 | 英语 |
| 学科领域 | Astronomy & Astrophysics |
| 文章类型 | Article |
| ISSN | 2041-8205 |
| URL | 查看原文 |
| 归档日期 | 2008-11-24 |
| WOS记录号 | WOS:000262733800013 |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 关键词[WOS] | PRE-CATACLYSMIC BINARY ; ECLIPSING SDB BINARY ; ORBITAL PERIOD ; ULTRAVIOLET OBJECTS ; UNSEEN COMPANION ; CLOSE BINARIES ; MASS-TRANSFER ; WZ SAGITTAE ; M DWARFS ; VIRGINIS |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/5805 |
| 专题 | 双星与变星研究组 |
| 通讯作者 | Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China. |
| 作者单位 | 1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences (CAS), P.O. Box 110, 650011 Kunming, China 2.United Laboratory of Optical Astronomy, Chinese Academy of Sciences (ULOAC), 100012 Beijing, China 3.Graduate University of the Chinese Academy of Sciences, 10049 Beijing, 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 | Qian SB,Dai ZB,Zhu LY,et al. MAGNETIC BRAKING AND THE EVOLUTION OF THE HW VIR-LIKE BINARY STARS[J]. ASTROPHYSICAL JOURNAL LETTERS,2008,689(1):L49-L52. |
| APA | Qian SB.,Dai ZB.,Zhu LY.,Liu L.,He JJ.,...&Qian, SB .(2008).MAGNETIC BRAKING AND THE EVOLUTION OF THE HW VIR-LIKE BINARY STARS.ASTROPHYSICAL JOURNAL LETTERS,689(1),L49-L52. |
| MLA | Qian SB,et al."MAGNETIC BRAKING AND THE EVOLUTION OF THE HW VIR-LIKE BINARY STARS".ASTROPHYSICAL JOURNAL LETTERS 689.1(2008):L49-L52. |
| 条目包含的文件 | ||||||
| 文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
| Magnetic Braking and（83KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | 浏览 请求全文 | |
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
修改评论