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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.
发表期刊ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2002-09
卷号142期号:1页码:139-143
DOI10.1086/341253
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 (s Equulei) Stars : Variables : Other
摘要Orbital 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).
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0067-0049
URL查看原文
归档日期2002-10-09
WOS记录号WOS:000177524600008
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]ORBITAL PERIOD MODULATION ; CLOSE BINARIES ; MAGNETIC CYCLES ; STARS ; SYSTEMS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5755
专题双星与变星研究组
通讯作者Qian, SB (reprint author), CAS, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
作者单位1.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)
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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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