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A NEW PHOTOMETRIC INVESTIGATION OF THE W UMA-TYPE BINARY BI CVn
Qian SB(钱声帮)1,2,3; He JJ(何家佳)1,2,3; Liu L(刘亮)1,2,3; Zhu LY(朱俐颖)1,2,3; Liao WP(廖文萍)1,2,3; Qian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
Source PublicationASTRONOMICAL JOURNAL
2008-12
Volume136Issue:6Pages:2493-2501
DOI10.1088/0004-6256/136/6/2493
Contribution Rank第1完成单位
Indexed BySCI
KeywordBinaries: Close Binaries: Eclipsing Stars: Individual (Bi Cvn) Stars: Evolution
AbstractNew photometric observations and their investigation of the W UMa-type binary, BI CVn, are presented. The variations of the orbital period were analyzed based on 12 new determined times of light minimum together with the others compiled from the literature. It is discovered that the period of BI CVn shows a long-term period decrease at a rate of. (P) over dot = -1.51(+/- 0.12) x 10(-7) days year(-1) while it undergoes a cyclic variation with a period of 27.0 years and an amplitude of 0(d).0151. Photometric solutions determined with the Wilson-Devinney method suggest that BI CVn is a contact binary with a degree of contact of 18.0(+/- 1.7)%. The asymmetry of the light curves was interpreted by the presence of dark spots on both components, and absolute parameters were determined by combining the photometric elements with the spectroscopic solutions given by Lu. The observed period decrease can be plausibly explained by a combination of the mass transfer from the primary to the secondary and angular momentum loss via magnetic braking. The cyclic period oscillation suggests that BI CVn is a triple system containing a tertiary component with a mass no less than 0.58 M(circle dot) in a 27.0 year orbit. As in the cases of the other contact binaries (e. g., AH Cnc, AP Leo, AD Cnc, and UX Eri), it is possible that this tertiary companion played an important role for the formation and evolution of the contact system by removing angular momentum from the central system via Kozai oscillation or a combination of Kozai cycle and tidal friction, which causes the eclipsing pair to have a short initial orbital period (e. g., P < 5(d)). In that case, can the initially detached system evolve into the present contact configuration via a combination of magnetic torques from stellar winds and a case A mass transfer?
Funding OrganizationYunnan Natural Science Foundation(2005A0059M) ; Chinese Natural Science(10573032, 10433030) ; National Key Fundamental Research Project(2007CB815406) ; Chinese Academy of Sciences(O8ZKY11001)
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN0004-6256
URL查看原文
Archive Date2008-11-24
WOS IDWOS:000261042500023
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordTHERMAL RELAXATION OSCILLATION ; ORBITAL PERIOD MODULATION ; URSAE MAJORIS SYSTEMS ; OVERCONTACT BINARIES ; CLOSE BINARIES ; LIGHT CURVES ; MASS-RATIO ; CONTACT ; PARAMETERS ; EVOLUTION
Citation statistics
Cited Times:27[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5806
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.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences (CAS), P.O. Box 110, 650011 Kunming, People's Republic of China
2.United Laboratory of Optical Astronomy, Chinese Academy of Sciences (ULOAC), 100012 Beijing, People's Republic of China
3.Graduate University of the Chinese Academy of Sciences, 10049 Beijing, People's Republic of China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Qian SB,He JJ,Liu L,et al. A NEW PHOTOMETRIC INVESTIGATION OF THE W UMA-TYPE BINARY BI CVn[J]. ASTRONOMICAL JOURNAL,2008,136(6):2493-2501.
APA Qian SB,He JJ,Liu L,Zhu LY,Liao WP,&Qian, SB .(2008).A NEW PHOTOMETRIC INVESTIGATION OF THE W UMA-TYPE BINARY BI CVn.ASTRONOMICAL JOURNAL,136(6),2493-2501.
MLA Qian SB,et al."A NEW PHOTOMETRIC INVESTIGATION OF THE W UMA-TYPE BINARY BI CVn".ASTRONOMICAL JOURNAL 136.6(2008):2493-2501.
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