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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; Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊ASTRONOMICAL JOURNAL
2014-11
卷号148期号:5
DOI10.1088/0004-6256/148/5/79
产权排序第1完成单位
收录类别SCI
关键词Binaries: Close Binaries: Eclipsing Stars: Evolution Stars: IndividuAl (Al Cas)
摘要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.
项目资助者Chinese Natural Science Foundation [11133007, 11325315]
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-6256
URL查看原文
归档日期2014-10-10
WOS记录号WOS:000344141200005
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]CLOSE-BINARY ; OVERCONTACT BINARY ; RADIAL-VELOCITY ; LIGHT CURVES ; STARS ; CATALOG ; PERIOD ; LEONIS ; CVN
引用统计
被引频次:14[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5892
专题双星与变星研究组
中国科学院天体结构与演化重点实验室
通讯作者Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
作者单位1.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
推荐引用方式
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.,...&Qian, SB .(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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