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VW Bootis: The shortest period close binary system at the beginning of the overcontact phase
Qian SB(钱声帮)1,2; Zhu LY(朱俐颖)1,2; Qian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
Source PublicationASTROPHYSICAL JOURNAL
2002-04-01
Volume568Issue:2Pages:1004-1007
DOI10.1086/338964
Contribution Rank第1完成单位
Indexed BySCI
KeywordBinaries : Close Stars : Evolution Stars : Individual (Vw Bootis)
AbstractA new orbital period of the very short-period (0.342 day) close binary system VW Bootis is determined and its O-C curve is formed based on the analysis of all available times of light minimum. It is discovered that the orbital period of the system shows a secular decrease with a rate of dP/dt = 1.56 x 10(-7) days per year. Since the order of the period decrease is larger than the thermal conservative mass-transfer estimate, the mass transfer would be dynamical or the period decrease is caused by the combination of mass transfer and angular momentum loss via magnetic braking. To satisfy such a period decrease, a conservative mass transfer (with no magnetic effect) from the more massive to the less massive component would be of the order dm/dt = 1.12 x 10(-7) M-. per year. The study of Rainger, Bell, & Hilditch ( 1990) has shown that VW Bootis is a marginal-contact system and is in the transition phase from B-type to W Ursae Majoris type. A hot spot on the secondary is also found near the neck of the binary star, indicating a primary-to-secondary mass transfer, which is in good agreement with the long time period decrease of the system. These findings suggest that VW Bootis is at the beginning of the overcontact phase. After the formation of a common convective envelope, the system will evolve into a normal overcontact binary.
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN0004-637X
URL查看原文
Archive Date2002-06-20
WOS IDWOS:000174625700043
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordURSAE MAJORIS SYSTEMS ; CONTACT
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Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5760
Collection双星与变星研究组
Corresponding AuthorQian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
Affiliation1.Yunnan Observatory, National Astronomical Observatories, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, Peoples Republic of China
2.United Laboratory of Optical Astronomy, Chinese Academy of Sciences (ULOAC)
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Qian SB,Zhu LY,Qian, SB . VW Bootis: The shortest period close binary system at the beginning of the overcontact phase[J]. ASTROPHYSICAL JOURNAL,2002,568(2):1004-1007.
APA Qian SB,Zhu LY,&Qian, SB .(2002).VW Bootis: The shortest period close binary system at the beginning of the overcontact phase.ASTROPHYSICAL JOURNAL,568(2),1004-1007.
MLA Qian SB,et al."VW Bootis: The shortest period close binary system at the beginning of the overcontact phase".ASTROPHYSICAL JOURNAL 568.2(2002):1004-1007.
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