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THE MULTI-COLOR LIGHT CURVES OF THE W UMa TYPE CONTACT BINARY EP ANDROMEDAE
Liao WP(廖文萍)1,2; Qian SB(钱声帮)1,2,3; Li K(李凯)1,2,3; He JJ(何家佳)1,2; Zhao EG(赵二刚)1,2; Zhou X(周肖)1,2,3
Source PublicationASTRONOMICAL JOURNAL
2013-10
Volume146Issue:4Pages:79-
DOI10.1088/0004-6256/146/4/79
Contribution Rank第1完成单位
Indexed BySCI
KeywordBinaries: Close Binaries: Eclipsing Stars: Individual (Ep Andromedae)
Abstract

New multi-color CCD photometric light curves of the eclipsing binary EP And were obtained over six nights in 2006, 2011, and 2012. Using the Wilson-Devinney code, we computed the photometric elements of this system. It was discovered that EP And is a W-type W UMa contact binary system with a mass ratio of q = 2.685 and a degree of contact factor f = 24.9%, rather than an A-type system. Combining 28 newly determined times of minimum light derived from 1999 to 2012 with others collected from the literature, a long-term increase (dP/dt = +5.22 x 10(-8) days yr(-1)) with a sinusoidal variation (A = 0.0109 days; T = 40.89 yr) in the orbital period was found. The orbital period secular increases may be interpreted as conservative mass transfer from the less massive component to the more massive one, and cyclic variations of the orbital period may be caused by the light-travel time effect through the presence of a third body. The evolutionary status and the age of the system are also discussed.

Funding ProjectSpecial Foundation of the President of The Chinese Academy of Sciences ; West Light Foundation of The Chinese Academy of Sciences ; Yunnan Natural Science Foundation[Y1XB041001] ; Chinese Natural Science Foundation[11133007]; Chinese Natural Science Foundation[11203066]; Chinese Natural Science Foundation[11103074]
Funding OrganizationSpecial Foundation of the President of The Chinese Academy of Sciences ; West Light Foundation of The Chinese Academy of Sciences ; Yunnan Natural Science Foundation[Y1XB041001] ; Chinese Natural Science Foundation[11133007, 11203066, 11103074]
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星天文学
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
Archive Date2013-11-05
WOS IDWOS:000324404800008
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordCYCLIC PERIOD CHANGES ; CLOSE BINARIES ; ADDITIONAL COMPONENTS ; EVOLUTIONARY STATUS ; ECLIPSING BINARY ; SYSTEMS ; CYGNI ; DEEP ; DRACONIS ; COMPANION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5876
Collection双星与变星研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorLiao WP(廖文萍)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 650011 Kunming, China
3.Graduate School of the CAS, Yuquan Road 19#, SijingShan Block, 100049 Beijing, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Liao WP,Qian SB,Li K,et al. THE MULTI-COLOR LIGHT CURVES OF THE W UMa TYPE CONTACT BINARY EP ANDROMEDAE[J]. ASTRONOMICAL JOURNAL,2013,146(4):79-.
APA Liao WP,Qian SB,Li K,He JJ,Zhao EG,&Zhou X.(2013).THE MULTI-COLOR LIGHT CURVES OF THE W UMa TYPE CONTACT BINARY EP ANDROMEDAE.ASTRONOMICAL JOURNAL,146(4),79-.
MLA Liao WP,et al."THE MULTI-COLOR LIGHT CURVES OF THE W UMa TYPE CONTACT BINARY EP ANDROMEDAE".ASTRONOMICAL JOURNAL 146.4(2013):79-.
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