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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
DOI10.1086/595727
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
ISSN2041-8205
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
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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
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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.
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