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HL Aurigae: A pre-contact binary system with a solar-mass companion
Qian SB(钱声帮)1,3; Zhu LY(朱俐颖)1,3; Boonruksar, S2; Qian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊NEW ASTRONOMY
2006-05
卷号11期号:7页码:503-507
DOI10.1016/j.newast.2005.12.002
产权排序第1完成单位
收录类别SCI ; EI
关键词Stars : Binaries : Close Stars : Binaries : Eclipsing Stars : Individuals : Hl Aurigae : Stars : Evolution
摘要Orbital period changes of the near-contact binary (NCB) system, HL Aurigae, are analyzed based upon all the published CCD and photoelectric times of light minimum. It is found that the period of HL Aurigae shows it small-amplitude cyclic oscillation with a period of 6.5 years and an amplitude of 0.(d)0058 while it undergoes it secular decrease at it rate of dP/dt = -1.08 x 10(-7) days/year. The cyclic period oscillation can be interpreted either by the light-time effect of a third body or by magnetic activity cycles of the components. Since the third-body assumption is in agreement with the presence of a large amount of third light in the system discovered by Gray et al. ( 1997), we think that H L Aurigae may be a true triple system. In order to deduce a G2-type third companion its proposed by Gray et al. (1997), the orbital inclination of the third body should be i' = 400, which is much smaller than that of the eclipsing pair (i = 85.degrees 7). This suggests that the third companion is not coplanar with the eclipsing binary. This may indicate that the solar-mass component may be captured by the eclipsing binary system in some previous stages of its formation and evolution. HL Aurigae is a short-period NCB with a F1V-type primary and a G9V-type secondary component and both of the components are filling or nearly filling their Roche lobes. As the period is decreasing, the shrinking of the Roche lobe will finally cause it to evolve into it contact binary system in the timescale of similar to 2.1 x 10(6) years. The period decrease may be caused by mass transfer or/and by angular momentum loss via magnetic braking. (c) 2006 Elsevier B.V. All rights reserved.
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN1384-1076
URL查看原文
归档日期2006-04-07
WOS记录号WOS:000237133600006
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]PERIOD ; PHASE
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5789
专题双星与变星研究组
通讯作者Qian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
作者单位1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, PR China
2.Astronomy Research Unit, Department of Physics, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
3.United Laboratory of Optical Astronomy, Chinese Academy of Sciences (ULOAC), 100012 Beijing, PR China
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Qian SB,Zhu LY,Boonruksar, S,et al. HL Aurigae: A pre-contact binary system with a solar-mass companion[J]. NEW ASTRONOMY,2006,11(7):503-507.
APA Qian SB,Zhu LY,Boonruksar, S,&Qian, SB .(2006).HL Aurigae: A pre-contact binary system with a solar-mass companion.NEW ASTRONOMY,11(7),503-507.
MLA Qian SB,et al."HL Aurigae: A pre-contact binary system with a solar-mass companion".NEW ASTRONOMY 11.7(2006):503-507.
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