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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.
Source PublicationASTROPHYSICAL JOURNAL LETTERS
2008-12-10
Volume689Issue:1Pages:L49-L52
DOI10.1086/595727
Contribution Rank第1完成单位
Indexed BySCI
KeywordBinaries: Close Binaries: Eclipsing Stars: Evolution Stars: Individual (Hw Vir)
AbstractHW 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.
Funding OrganizationYunnan Natural Science Foundation(2005A0059M) ; Chinese Natural Science Foundation(10573032, 10433030) ; National Key Fundamental Research Project(2007CB815406) ; Chinese Academy of Sciences(O8ZKY11001)
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN2041-8205
URL查看原文
Archive Date2008-11-24
WOS IDWOS:000262733800013
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordPRE-CATACLYSMIC BINARY ; ECLIPSING SDB BINARY ; ORBITAL PERIOD ; ULTRAVIOLET OBJECTS ; UNSEEN COMPANION ; CLOSE BINARIES ; MASS-TRANSFER ; WZ SAGITTAE ; M DWARFS ; VIRGINIS
Citation statistics
Cited Times:20[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5805
Collection双星与变星研究组
Corresponding AuthorQian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
Affiliation1.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
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
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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