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OPTICAL FLARES AND A LONG-LIVED DARK SPOT ON A COOL SHALLOW CONTACT BINARY
Qian SB(钱声帮)1,2,3; Wang JJ(王晶晶)1,2,3; Zhu LY(朱俐颖)1,2,3; Snoonthornthum, B4; Wang, LZ5; Zhao EG(赵二刚)1,2; Zhou X(周肖)1,2,3; Liao WP(廖文萍)1,2; Liu NP(刘念平)1,2,3
Source PublicationASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2014-05
Volume212Issue:1Pages:4-18
DOI10.1088/0067-0049/212/1/4
Contribution Rank第1完成单位
Indexed BySCI
KeywordBinaries: Close Binaries: Eclipsing Stars: Activity Stars: Evolution Stars: Individual (Cstar 038663)
Abstract

W UMa-type stars are contact systems where both cool components fill the critical Roche lobes and share a common convective envelope. Long and unbroken time-series photometry is expected to play an important role in their origin and activity. The newly discovered short-period W UMa-type star, CSTAR 038663, was monitored continuously by Chinese Small Telescope ARray (CSTAR) in Antarctica during the winters of 2008 and 2010. There were 15 optical flares recorded in the i band during the winter of 2010. This was the first time such flares were detected from a W UMa-type star. By analyzing the nearly unbroken photometric data from 2008, it is discovered that CSTAR 038663 is a W-type shallow contact binary system (f = 10.6(+/- 2.9)%) with a high mass ratio of q = 1.12(+/- 0.01), where the less massive component is slightly hotter than the more massive one. The asymmetric light curves are explained by the presence of a dark spot on the more massive component. Its temperature is about 800 K lower than the stellar photosphere and it covers 2.1% of the total photospheric surface. The lifetime of the dark spot is longer than 116 days. Using 725 eclipse times, we found that the observed-calculated (O-C) curve may show a cyclic variation that is explained by the presence of a close-in third body. Both the shallow contact configuration and the extremely high mass ratio suggest that CSTAR 038663 is presently evolving into a contact system with little mass transfer. The formation and evolution is driven by the loss of angular momentum via magnetic braking, and the close-in companion star is expected to play an important role, removing angular momentum from the central eclipsing binary.

Funding ProjectChinese Natural Science Foundation[11133007] ; Chinese Natural Science Foundation[11325315]
Funding OrganizationChinese Natural Science Foundation[11133007, 11325315]
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
ISSN0067-0049
URL查看原文
Archive Date2014-05-08
WOS IDWOS:000339232600004
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS Keyword4-COLOR LIGHT CURVES ; CLOSE-BINARY ; OBSERVATIONAL DATA ; ECLIPSING BINARY ; VARIABLE-STARS ; PERIOD CHANGES ; MASS-RATIO ; DOME ; ANTARCTICA ; SYSTEM
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5901
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 AuthorQian SB(钱声帮)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences (CAS), P.O. Box 110, 650011 Kunming, China
2.Key laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China
3.University of the Chinese Academy of Sciences, Yuquan Road 19#, Sijingshang Block, 100049 Beijing, China
4.National Astronomical Research Insititude of Thailand, 191 Siriphanich Bldg., Huay Kaew Rd., Chiang Mai 50200, Thailand
5.National Astronomical Observatories, Chinese Academy of Sciences, 100012 Beijing, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Qian SB,Wang JJ,Zhu LY,et al. OPTICAL FLARES AND A LONG-LIVED DARK SPOT ON A COOL SHALLOW CONTACT BINARY[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2014,212(1):4-18.
APA Qian SB.,Wang JJ.,Zhu LY.,Snoonthornthum, B.,Wang, LZ.,...&Liu NP.(2014).OPTICAL FLARES AND A LONG-LIVED DARK SPOT ON A COOL SHALLOW CONTACT BINARY.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,212(1),4-18.
MLA Qian SB,et al."OPTICAL FLARES AND A LONG-LIVED DARK SPOT ON A COOL SHALLOW CONTACT BINARY".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 212.1(2014):4-18.
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