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AL CASSIOPEIAE: AN F-TYPE CONTACT BINARY SYSTEM WITH A COOL STELLAR COMPANION
Qian SB(钱声帮)1,2,3; Zhou X(周肖)1,2,3; Zola, S4,5; Zhu LY(朱俐颖)1,2,3; Zhao EG(赵二刚)1,2; Liao WP(廖文萍)1,2; Leung, KC6
Source PublicationASTRONOMICAL JOURNAL
2014-11
Volume148Issue:5
DOI10.1088/0004-6256/148/5/79
Contribution Rank第1完成单位
Indexed BySCI
KeywordBinaries: Close Binaries: Eclipsing Stars: Evolution Stars: IndividuAl (Al Cas)
Abstract

According to the general catalog of variable stars, AL Cas was classified as an EW-type eclipsing binary with a spectral type of B and an orbital period of P = 0.5005555 days. The first photometric light curves of the close binary in the B, V, R, and I bands are presented. New low-resolution spectra indicate that its spectral type is about F7 rather than B-type. A photometric analysis with the Wilson-Devinney method suggests that it is a contact binary (f = 39.3%) with a mass ratio of 0.61. Using 17 newly determined eclipse times together with those collected from the literature, we found that the observed-calculated (O - C) curve of AL Cas shows a cyclic change with a period of 86.6 yr and an amplitude of 0.0181 days. The periodic variation was analyzed for the light-travel time effect via the presence of a third body. The mass of the third body was determined to be M-3 sin i' = 0.29(+/- 0.05) M-circle dot when a total mass of 2.14 M-circle dot for AL Cas is adopted. It is expected that the cool companion star may have played an important role in the origin and evolution of the system by removing angular momentum from the central binary system during early dynamical interaction and/or late dynamical evolution. This causes the original detached system to have a low angular momentum and a short initial orbital period. Then it can evolve into the present contact configuration via a case A mass transfer.

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
ISSN0004-6256
URL查看原文
Archive Date2014-10-10
WOS IDWOS:000344141200005
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordCLOSE-BINARY ; OVERCONTACT BINARY ; RADIAL-VELOCITY ; LIGHT CURVES ; STARS ; CATALOG ; PERIOD ; LEONIS ; CVN
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5892
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, Republic of China
2.Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, Republic of China
3.University of the Chinese Academy of Sciences, Yuquan Road 19, Sijingshang Block, 100049 Beijing, Republic of China
4.Mt. Suhora Observatory, Cracow Pedagogical University, ul. Podchorazych 2, 30-084 Krakow, Poland
5.Astronomical Observatory, Jagiellonian University, ul. Orla 171, 30-244 Krakow, Poland
6.Department of Physics and Astronomy, University of Nebraska, Lincoln, NE 68588-0111, USA
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Qian SB,Zhou X,Zola, S,et al. AL CASSIOPEIAE: AN F-TYPE CONTACT BINARY SYSTEM WITH A COOL STELLAR COMPANION[J]. ASTRONOMICAL JOURNAL,2014,148(5).
APA Qian SB.,Zhou X.,Zola, S.,Zhu LY.,Zhao EG.,...&Leung, KC.(2014).AL CASSIOPEIAE: AN F-TYPE CONTACT BINARY SYSTEM WITH A COOL STELLAR COMPANION.ASTRONOMICAL JOURNAL,148(5).
MLA Qian SB,et al."AL CASSIOPEIAE: AN F-TYPE CONTACT BINARY SYSTEM WITH A COOL STELLAR COMPANION".ASTRONOMICAL JOURNAL 148.5(2014).
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