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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
Source PublicationASTRONOMICAL JOURNAL
2015-04-01
Volume149Issue:4
DOI10.1088/0004-6256/149/4/120
Indexed BySCI
KeywordBinaries: Close Binaries: Eclipsing Stars: Individual (Ty Uma)
Abstract

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.

Funding ProjectNational Natural Science Foundation of China[11203016] ; National Natural Science Foundation of China[11333002] ; National Natural Science Foundation of China[10778619] ; National Natural Science Foundation of China[10778701] ; National Natural Science Foundation of China[U1431105] ; Natural Science Foundation of Shandong Province[ZR2012AQ008] ; Natural Science Foundation of Shandong Province[ZR2014AQ019] ; Key Laboratory for the Structure and Evolution of Celestial Objects[OP201303]
Funding OrganizationNational 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]
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星形成与演化
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-6256
URL查看原文
WOS IDWOS:000352336800004
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordCLOSE BINARIES ; LIGHT CURVES ; COMPANIONS ; SYSTEM
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/7561
Collection中国科学院天体结构与演化重点实验室
Corresponding AuthorLi, K.
Affiliation1.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
Recommended Citation
GB/T 7714
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..,...&Odell, Andrew P..(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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