MAGNETIC BRAKING AND THE EVOLUTION OF THE HW VIR-LIKE BINARY STARS
文献类型：期刊论文
| 作者 | 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
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| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
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| 出版日期 | 2008-12-10 |
| 卷号 | 689期号:1页码:L49-L52 |
| 关键词 | binaries: close binaries: eclipsing stars: evolution stars: individual (HW Vir) |
| ISSN号 | 2041-8205 |
| 产权排序 | 第一完成单位 |
| 通讯作者 | Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China. |
| 英文摘要 | 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. |
| 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] | PRE-CATACLYSMIC BINARY ; ECLIPSING SDB BINARY ; ORBITAL PERIOD ; ULTRAVIOLET OBJECTS ; UNSEEN COMPANION ; CLOSE BINARIES ; MASS-TRANSFER ; WZ SAGITTAE ; M DWARFS ; VIRGINIS |
| 收录类别 | SCI |
| 原文出处 | http://iopscience.iop.org/1538-4357/689/1/L49/ |
| 语种 | 英语 |
| WOS记录号 | WOS:000262733800013 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/5805]  |
| 专题 | 云南天文台_双星与变星研究组 |
| 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 |
| 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.,...&Li LJ.(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. |
入库方式： OAI收割
来源：云南天文台
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