THE ACTIVE CONTACT BINARY TY UMA REVISITED: IS IT A QUADRUPLE STAR?
Li, K.1,2; Hu, S. -M.1; Guo, D. -F.1; Jiang, Y. -G.1; Gao, Y. -G.1; Chen, X.1; Odell, Andrew P.3; Li, K (kaili@sdu.edu.cn), Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209, China
发表期刊ASTRONOMICAL JOURNAL
2015-04-01
卷号149期号:4
DOI10.1088/0004-6256/149/4/120
收录类别SCI
关键词Binaries: Close Binaries: Eclipsing Stars: Individual (Ty Uma)
摘要TY UMa is an F-type eclipsing binary star. Four-color light curves and radial velocities of this system were presented and simultaneously analyzed using the W-D code. It is found that TY UMa is a W-subtype shallow contact binary system (f = 13.4%) with a mass ratio of q = 2.523. In order to explain the asymmetric light curve of this binary, a dark spot on the less massive component was employed. Our newly determined 31 times of minimum light, including those collected from the literature, have been used to analyze orbital period changes of TY UMa. The complicated period variation could be sorted into a secular period increase at a rate of dp/dt = +5.18(+/- 0.21) x 10(-7) days yr(-1), a 51.7 yr periodic modulation (A(3) = 0.0182 days), and a very small amplitude cyclic oscillation with a period of 10.0 yr (A(4) = 0.0015 days). The long-term increase of the period can be explained by mass transfer from the less massive component to the more massive one. The Applegate mechanism may impossibly explain the two cyclic components in the period. The two cyclic variations are very likely caused by the light travel time effect of third and fourth components, suggesting that TY UMa is a quadruple system.
项目资助者National Natural Science Foundation of China (11203016,11333002, 10778619, 10778701, U1431105) ; Natural Science Foundation of Shandong Province (ZR2012AQ008, ZR2014AQ019) ; Key Laboratory for the Structure and Evolution of Celestial Objects (OP201303)
语种英语
学科领域天文学
文章类型Article
ISSN0004-6256
URL查看原文
WOS记录号WOS:000352336800004
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]CLOSE BINARIES ; LIGHT CURVES ; COMPANIONS ; SYSTEM
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被引频次:4[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/7561
专题中国科学院天体结构与演化重点实验室
通讯作者Li, K (kaili@sdu.edu.cn), Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209, China
作者单位1.Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
3.Dept of Physics and Astronomy, Northern Arizona University, Flagstaff, AZ 86011, USA
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Li, K.,Hu, S. -M.,Guo, D. -F.,et al. THE ACTIVE CONTACT BINARY TY UMA REVISITED: IS IT A QUADRUPLE STAR?[J]. ASTRONOMICAL JOURNAL,2015,149(4).
APA Li, K..,Hu, S. -M..,Guo, D. -F..,Jiang, Y. -G..,Gao, Y. -G..,...&Li, K .(2015).THE ACTIVE CONTACT BINARY TY UMA REVISITED: IS IT A QUADRUPLE STAR?.ASTRONOMICAL JOURNAL,149(4).
MLA Li, K.,et al."THE ACTIVE CONTACT BINARY TY UMA REVISITED: IS IT A QUADRUPLE STAR?".ASTRONOMICAL JOURNAL 149.4(2015).
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