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Photometric study and period variation investigation of the WUMa-type binary EQUMa
Hu, Shao Ming1; Li, Kai1,2; Guo, D. -F.1; Jiang, Yunguo1; Gao, Dongyang1; Chen, Xu1
Source PublicationPUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
2015-10
Volume37Issue:5
DOI10.1093/pasj/psv069
Indexed BySCI
KeywordBinaries: Close Binaries: Eclipsing Stars: Individual (Eq Uma)
Abstract

Four-color light curves of EQ UMa were obtained with the 1.0 m telescope at Weihai Observatory, Shandong University. The light variability of EQ UMa is typical of a W UMa-type binary. By analyzing the four-color light curves simultaneously, we found that EQ UMa is a semi-detached binary with the less massive component filling its inner Roche lobe. The very short period and the Algol-type configuration make EQ UMa a very good target to challenge the formation and evolution theory of low-mass Algols. We investigated the orbital period change of EQ UMa by all available times of minimum light. It is shown that the orbital period of EQ UMa displays a cyclic oscillation with a period of 12.1 yr super-imposed on long-term increase with a rate of dp/dt = 1.77 x 10(-7) dyr(-1). The long-term period increase should be caused by themass transfer from the less massive component to the more massive one. The cyclic modulation is very probably produced by the light travel time effect of a third component.

Funding ProjectNational Natural Science Foundation of China[11203016] ; National Natural Science Foundation of China[11333002] ; 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, 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 ; 天体物理学 ; 实测天体物理学 ; 恒星与银河系 ; 恒星天文学 ; 恒星形成与演化
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherOXFORD UNIV PRESS
Publication PlaceGREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
ISSN0004-6264
URL查看原文
WOS IDWOS:000362834000022
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordURSAE MAJORIS SYSTEMS ; CONTACT BINARY ; LIGHT CURVES ; STAR ; EVOLUTION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/9383
Collection中国科学院天体结构与演化重点实验室
Corresponding AuthorLi, Kai
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
Recommended Citation
GB/T 7714
Hu, Shao Ming,Li, Kai,Guo, D. -F.,et al. Photometric study and period variation investigation of the WUMa-type binary EQUMa[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2015,37(5).
APA Hu, Shao Ming,Li, Kai,Guo, D. -F.,Jiang, Yunguo,Gao, Dongyang,&Chen, Xu.(2015).Photometric study and period variation investigation of the WUMa-type binary EQUMa.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,37(5).
MLA Hu, Shao Ming,et al."Photometric study and period variation investigation of the WUMa-type binary EQUMa".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 37.5(2015).
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