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S Equulei: A low mass ratio Algol-type eclipsing binary at the active phase of mass transfer
Qian SB(钱声帮)1,2; Zhu LY(朱俐颖)1,2; Qian, SB (reprint author), CAS, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
Source PublicationASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2002-09
Volume142Issue:1Pages:139-143
DOI10.1086/341253
Contribution Rank第1完成单位
Indexed BySCI
KeywordBinaries : Close Binaries : Eclipsing Stars : Evolution Stars : Individual (s Equulei) Stars : Variables : Other
AbstractOrbital period change of a low mass ratio (q = 0.13) Algol-type eclipsing binary, S Equulei, is presented based on the analysis of its century-long times of light minimum. Alternate period changes are discovered to superimpose on a rather rapid period increase with rate of dP/dt = +1.27 x 10(-6) days yr(-1). The alternate period changes can be explained either by the variation in the gravitational quadruple momentum via the cyclic magnetic activity of the G-type secondary or by the light-time effect via the presence of a third body. Since the third-body assumption is in good agreement with Zola's photometric solution, S Equ may be a truly triple system. The third body is rotating in an eccentric orbit (e' = 0.37) with an orbital inclination of i' - 16degrees, which is rather smaller than that of the eclipsing binary system (i = 88.degrees3). This indicates that the third body may be captured by the eclipsing pair. New accurate photometric and spectroscopic data over the next decade are very important to verify this conclusion. The rapid period increase suggests that S Equ is a low mass ratio Algol-type binary system in an active phase of mass exchange. To satisfy such a period increase, a conservative mass transfer from the less massive to the more massive components would be of the order dm/dt = 4.94 x 10(-8) M. yr(-1).
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN0067-0049
URL查看原文
Archive Date2002-10-09
WOS IDWOS:000177524600008
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordORBITAL PERIOD MODULATION ; CLOSE BINARIES ; MAGNETIC CYCLES ; STARS ; SYSTEMS
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Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5755
Collection双星与变星研究组
Corresponding AuthorQian, SB (reprint author), CAS, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
Affiliation1.Yunnan Observatory, National Astronomical Observatories, CAS, P.O. Box 110, 650011 Kunming, People's 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 . S Equulei: A low mass ratio Algol-type eclipsing binary at the active phase of mass transfer[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2002,142(1):139-143.
APA Qian SB,Zhu LY,&Qian, SB .(2002).S Equulei: A low mass ratio Algol-type eclipsing binary at the active phase of mass transfer.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,142(1),139-143.
MLA Qian SB,et al."S Equulei: A low mass ratio Algol-type eclipsing binary at the active phase of mass transfer".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 142.1(2002):139-143.
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