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Ternarity, activity, and evolutionary state of the WUMa-type binary UX Eridani
Qian SB(钱声帮)1,2,3; Yuan JZ(袁金照)1,2,3; Xiang, FY4; Soonthornthum, B5,6; Zhu LY(朱俐颖)1,2,3; He JJ(何家佳)1,2,3; Qian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊ASTRONOMICAL JOURNAL
2007-11
卷号134期号:5页码:1769-1776
DOI10.1086/521927
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 (Ux Eridani) Stars : Magnetic Fields
摘要Charge-coupled device photometric observations of the W UMa-type binary star UX Eridani are presented. Comparing the B light curve with that obtained by Binnendijk in 1964-1965, the variation of the light curve around the primary minimum was found. Photometric solutions of Binnendijk's and our light curves were derived by using the new version of the Wilson-Devinney program. Our solutions confirmed that UX Eri is a marginal W-type overcontact binary system with a very low degree of overcontact, f < 15%. The change of the light curve around the primary minimum was explained as the disappearance of a dark spot on the more massive component star. This suggests that UX Eri shows strong magnetic activity, which is in agreement with its having the highest X-ray flux among 57 W UMa-type binary stars studied by Stepien et al. The high level of magnetic activity was interpreted as the result of a shallow common convective envelope. Orbital period changes were analyzed using several newly determined CCD times of light minimum together with others collected from the literature. A cyclic period change (T = 45.3 yr) was found to be superimposed on a long-term increase (dP/dt = +7.7 x 10(-8) days yr(-1)). The period oscillation and the existence of third light both confirm that UX Eri contains a tertiary component. Since no spectroscopic companion was found, it is estimated that the mass of the third body is M-3 < 0.56M(circle dot). The tertiary component star is moving in an eccentric orbit ( e' = 0.72) with an orbital inclination of i' > 44.5 circle dot. The tertiary component may have played an important role in the formation of the progenitor of UX Eri by transferring angular momentum during the Kozai oscillation. In that way, the detached progenitor could evolve into overcontact configuration via magnetic braking. It was found that the timescale of the period increase is close to the thermal timescale of the less massive component, which suggests that UX Eri is in an evolutionary state of thermally conservative mass transfer from the less massive component to the more massive one.
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-6256
URL查看原文
归档日期2007-12-20
WOS记录号WOS:000250518400004
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]THERMAL RELAXATION OSCILLATION ; ORBITAL PERIOD MODULATION ; FOURIER-ANALYSIS ; LIGHT CURVES ; ECLIPSING VARIABLES ; CONTACT BINARIES ; ADDITIONAL COMPONENTS ; OVERCONTACT BINARIES ; COMAE BERENICES ; MASS-RATIO
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5796
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, China
2.United Laboratory of Optical Astronomy, Chinese Academy of Sciences, 100012 Beijing, China
3.Graduate School, Chinese Academy of Sciences, 100012 Beijing, China
4.Physics Department, Xiangtan University, 411105 Xiangtan, Funan Province, China
5.Astronomy Research Unit, Sirindhorn Observatory, and Department of Physics, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
6.National Astronomical Research Institute of Thailand/Ministry of Science and Technology, Bangkok, Thailand
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Qian SB,Yuan JZ,Xiang, FY,et al. Ternarity, activity, and evolutionary state of the WUMa-type binary UX Eridani[J]. ASTRONOMICAL JOURNAL,2007,134(5):1769-1776.
APA Qian SB.,Yuan JZ.,Xiang, FY.,Soonthornthum, B.,Zhu LY.,...&Qian, SB .(2007).Ternarity, activity, and evolutionary state of the WUMa-type binary UX Eridani.ASTRONOMICAL JOURNAL,134(5),1769-1776.
MLA Qian SB,et al."Ternarity, activity, and evolutionary state of the WUMa-type binary UX Eridani".ASTRONOMICAL JOURNAL 134.5(2007):1769-1776.
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