A NEW PHOTOMETRIC INVESTIGATION OF THE W UMA-TYPE BINARY BI CVn
文献类型：期刊论文
| 作者 | Qian SB(钱声帮)1,2,3 ; He JJ(何家佳)1,2,3; Liu L(刘亮)1,2,3; Zhu LY(朱俐颖)1,2,3; Liao WP(廖文萍)1,2,3
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| 刊名 | ASTRONOMICAL JOURNAL
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| 出版日期 | 2008-12 |
| 卷号 | 136期号:6页码:2493-2501 |
| ISSN号 | 0004-6256 |
| 关键词 | binaries: close binaries: eclipsing stars: individual (BI CVn) stars: evolution |
| 通讯作者 | Qian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China. |
| 产权排序 | 第一完成单位 |
| 英文摘要 | New photometric observations and their investigation of the W UMa-type binary, BI CVn, are presented. The variations of the orbital period were analyzed based on 12 new determined times of light minimum together with the others compiled from the literature. It is discovered that the period of BI CVn shows a long-term period decrease at a rate of. (P) over dot = -1.51(+/- 0.12) x 10(-7) days year(-1) while it undergoes a cyclic variation with a period of 27.0 years and an amplitude of 0(d).0151. Photometric solutions determined with the Wilson-Devinney method suggest that BI CVn is a contact binary with a degree of contact of 18.0(+/- 1.7)%. The asymmetry of the light curves was interpreted by the presence of dark spots on both components, and absolute parameters were determined by combining the photometric elements with the spectroscopic solutions given by Lu. The observed period decrease can be plausibly explained by a combination of the mass transfer from the primary to the secondary and angular momentum loss via magnetic braking. The cyclic period oscillation suggests that BI CVn is a triple system containing a tertiary component with a mass no less than 0.58 M(circle dot) in a 27.0 year orbit. As in the cases of the other contact binaries (e. g., AH Cnc, AP Leo, AD Cnc, and UX Eri), it is possible that this tertiary companion played an important role for the formation and evolution of the contact system by removing angular momentum from the central system via Kozai oscillation or a combination of Kozai cycle and tidal friction, which causes the eclipsing pair to have a short initial orbital period (e. g., P < 5(d)). In that case, can the initially detached system evolve into the present contact configuration via a combination of magnetic torques from stellar winds and a case A mass transfer? |
| 学科主题 | Astronomy & Astrophysics |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | THERMAL RELAXATION OSCILLATION ; ORBITAL PERIOD MODULATION ; URSAE MAJORIS SYSTEMS ; OVERCONTACT BINARIES ; CLOSE BINARIES ; LIGHT CURVES ; MASS-RATIO ; CONTACT ; PARAMETERS ; EVOLUTION |
| 收录类别 | SCI |
| 原文出处 | http://iopscience.iop.org/1538-3881/136/6/2493/ |
| 语种 | 英语 |
| WOS记录号 | WOS:000261042500023 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/5806]  |
| 专题 | 云南天文台_双星与变星研究组 |
| 作者单位 | 1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences (CAS), P.O. Box 110, 650011 Kunming, People's Republic of China 2.United Laboratory of Optical Astronomy, Chinese Academy of Sciences (ULOAC), 100012 Beijing, People's Republic of China 3.Graduate University of the Chinese Academy of Sciences, 10049 Beijing, People's Republic of China |
| 推荐引用方式 GB/T 7714 | Qian SB,He JJ,Liu L,et al. A NEW PHOTOMETRIC INVESTIGATION OF THE W UMA-TYPE BINARY BI CVn[J]. ASTRONOMICAL JOURNAL,2008,136(6):2493-2501. |
| APA | Qian SB,He JJ,Liu L,Zhu LY,&Liao WP.(2008).A NEW PHOTOMETRIC INVESTIGATION OF THE W UMA-TYPE BINARY BI CVn.ASTRONOMICAL JOURNAL,136(6),2493-2501. |
| MLA | Qian SB,et al."A NEW PHOTOMETRIC INVESTIGATION OF THE W UMA-TYPE BINARY BI CVn".ASTRONOMICAL JOURNAL 136.6(2008):2493-2501. |
入库方式： OAI收割
来源：云南天文台
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