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The first photometric investigation and period study of two W UMa-type binary systems: EF CVn and EH CVn
Xia, Qi-Qi1; Li, Kai1,2; Chen, Xu1; Guo, Di-Fu1; Gao, Dong-Yang1
Source PublicationPUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
2018-12-01
Volume70Issue:6Pages:11
DOI10.1093/pasj/psy103
Indexed BySCI
Keywordbinaries: close binaries: eclipsing stars: individual (EF CVn, EH CVn)
Abstract

By analyzing the V, R-c, and I-c light curves of the two neglected W U Ma-type binaries EF CVn and EH CVn using the Wilson-Devinney code, we have discovered that EF CVn is a median contact binary while EH CVn is a shallow contact binary, and they are both W-subtype binary systems. The mass ratio and fillout factor of EF CVn are q = 3.493 +/- 0.063 and f = 32.0% +/- 12.9%, respectively. Those of EH CVn are q = 3.331 +/- 0.052 and f= 19.2% +/- 10.9%, respectively. The addition of a dark spot on the secondary star is used to interpret the asymmetric light curves of EF CVn. An orbital period analysis of EF CVn indicates that there is a cyclic oscillation with an amplitude of 0.0064d and a period of 15.65 yr, accompanied by a continuous increase at a rate of dp/dt = 4.52 x 10(-7) d yr(-1). The periodic oscillation can reasonably be explained by the light travel-time effect of an additional component. The secular increase is probably generated by conservative mass transfer from the primary star to the secondary star. Mean-while, an analysis of the orbital period of EH CVn was also performed. A long-term period decrease at a rate of dp/dt= -5.20 x 10(-8) d yr(-1) was discovered; this is possibly interpreted as caused by mass transfer from the more massive component to the less massive component.

Funding ProjectChinese Natural Science Foundation[11703016] ; National Natural Science Foundation of China (NSFC) ; Chinese Academy of Sciences (CAS) ; Natural Science Foundation of Shandong Province[ZR2014AQ019] ; Natural Science Foundation of Shandong Province[ZR2017PA010] ; Natural Science Foundation of Shandong Province[JQ201702] ; Young Scholars Program of Shandong University, Weihai[20820162003] ; Young Scholars Program of Shandong University, Weihai[20820171006] ; Open Research Program of the Key Laboratory for the Structure and Evolution of Celestial Objects[OP201704] ; National Development and Reform Commission ; Joint Research Fund in Astronomy[U1431105]
Funding OrganizationChinese Natural Science Foundation[11703016] ; National Natural Science Foundation of China (NSFC) ; Chinese Academy of Sciences (CAS) ; Natural Science Foundation of Shandong Province[ZR2014AQ019, ZR2017PA010, JQ201702] ; Young Scholars Program of Shandong University, Weihai[20820162003, 20820171006] ; Open Research Program of the Key Laboratory for the Structure and Evolution of Celestial Objects[OP201704] ; National Development and Reform Commission ; Joint Research Fund in Astronomy[U1431105]
Language英语
Subject Area天文学 ; 恒星与银河系
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:000456072300006
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordTHERMAL RELAXATION OSCILLATION ; LIGHT CURVES ; MASS-RATIO ; CONTACT ; EVOLUTION ; MODULATION ; STARS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/18923
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, Kunming 650011, China
Recommended Citation
GB/T 7714
Xia, Qi-Qi,Li, Kai,Chen, Xu,et al. The first photometric investigation and period study of two W UMa-type binary systems: EF CVn and EH CVn[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2018,70(6):11.
APA Xia, Qi-Qi,Li, Kai,Chen, Xu,Guo, Di-Fu,&Gao, Dong-Yang.(2018).The first photometric investigation and period study of two W UMa-type binary systems: EF CVn and EH CVn.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,70(6),11.
MLA Xia, Qi-Qi,et al."The first photometric investigation and period study of two W UMa-type binary systems: EF CVn and EH CVn".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 70.6(2018):11.
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