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PHOTOMETRIC ANALYSIS OF THE OVERCONTACT BINARY CW CAS
Wang JJ(王晶晶)1,2,3; Qian SB(钱声帮)1,2,3; He JJ(何家佳)1,2,3; Li LJ(李临甲)1,2,3; Zhao EG(赵二刚)1,2,3
Source PublicationASTRONOMICAL JOURNAL
2014-11
Volume148Issue:5
DOI10.1088/0004-6256/148/5/95
Contribution Rank第1完成单位
Indexed BySCI
KeywordBinaries: Close Binaries: Eclipsing Stars: Individual (Cw Cas)
Abstract

New CCD photometric observations of overcontact binary CWCas were carried out in 2004 and 2011. In particular, the light curve obtained in 2004 shows a remarkable O'Connell effect. Compared with light curves in different observing seasons, variations were found. These variations can be explained by dark spot activities on the surface of at least one component. Using the Wilson-Devinney code with a spot model, we find that the photometric solutions confirm CWCas is a shallow W-subtype overcontact binary with a spotted massive component. Our new determined times of minimum light together with the others published in the literature were analyzed to find a change of orbital period. From the O - C curves, the period of the system shows a cyclic period change (P-3 = 69.9 yr, A(3) = 0.03196 days) superposed on the linear increase. The cyclic variation, if explained as the light-travel time effect, reveals the presence of a tertiary companion.

Funding ProjectChinese Natural Science Foundation[11133007] ; Chinese Natural Science Foundation[10973037] ; Chinese Natural Science Foundation[10903026] ; Chinese Natural Science Foundation[11103074] ; West Light Foundation of the Chinese Academy of Science
Funding OrganizationChinese Natural Science Foundation[11133007, 10973037, 10903026, 11103074] ; West Light Foundation of the Chinese Academy of Science
Language英语
Subject Area天文学 ; 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
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-6256
URL查看原文
Archive Date2014-11-03
WOS IDWOS:000344141200021
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordRADIAL-VELOCITY ; LIGHT CURVES ; PERIOD CHANGES ; CONTACT BINARIES ; ORBITAL PERIOD ; CLOSE BINARIES ; CCD PHOTOMETRY ; STARS ; SYSTEMS ; WILSON
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5893
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 AuthorWang JJ(王晶晶)
Affiliation1.National Astronomical Observatories/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, PR China
3.Graduate School of the Chinese Academy of Sciences, Yuquan Road 19, Shijingshan Block, 100049 Beijing, PR China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Wang JJ,Qian SB,He JJ,et al. PHOTOMETRIC ANALYSIS OF THE OVERCONTACT BINARY CW CAS[J]. ASTRONOMICAL JOURNAL,2014,148(5).
APA Wang JJ,Qian SB,He JJ,Li LJ,&Zhao EG.(2014).PHOTOMETRIC ANALYSIS OF THE OVERCONTACT BINARY CW CAS.ASTRONOMICAL JOURNAL,148(5).
MLA Wang JJ,et al."PHOTOMETRIC ANALYSIS OF THE OVERCONTACT BINARY CW CAS".ASTRONOMICAL JOURNAL 148.5(2014).
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