| Photometric Investigation and Possible Light-Time Effect in the Orbital Period of a Marginal Contact System, CW Cassiopeiae | |
Jiang TY(姜天雨)1,2,3 ; Li LF(李立芳)1,3; Han ZW(韩占文)1,3; Jiang DK(姜登凯)1,2,3; Jiang, TY (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Yunnan Province, Peoples R China.
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| 发表期刊 | PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
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| 2010 | |
| 卷号 | 62期号:2页码:457-465 |
| DOI | 10.1093/pasj/62.2.457 |
| 产权排序 | 第1完成单位 |
| 收录类别 | SCI ; EI |
| 关键词 | Stars: Binaries: Close Stars: Binaries: Eclipsing Stars: Evolution Stars: Individual (Cw Cassiopeiae) |
| 摘要 | The first complete charge-coupled device (CCD) light curves in B and V passbands of a neglected contact binary system, CW Cassiopeiae (CW Cas), are presented. They were analyzed simultaneously by using the Wilson and Devinney (WD) code (1971, ApJ, 166, 605). The photometric solution indicates that CW Cas is a W-type W UMa system with a mass ratio of m(2)/m(1) = 2.234, and that it is in a marginal contact state with a contact degree of similar to 6.5% and a relatively large temperature difference of similar to 327 K between its two components. Based on the minimum times collected from the literature, together with the new ones obtained in this study, the orbital period changes of CW Cas were investigated in detail. It was found that a periodical variation overlaps with a secular period decrease in its orbital period. The long-term period decrease with a rate of dP/dt = 3.44 x 10(-8)d yr(-1) can be interpreted either. by mass transfer from the more-massive component to the less-massive with a rate of dm(2)/dt = 3.6 x 10(-8) M(circle dot) yr(-1), or by mass and angular-momentum losses through magnetic braking clue to a magnetic stellar wind. A low-amplitude cyclic variation with a period of T = 63.7 yr might be caused by the light-time effect due to the presence of a third body. |
| 项目资助者 | National Natural Science Foundation of China [10673029, 10773026, 10821061, 2007CB815406] ; Yunnan Natural Science Foundation [2007A113M] |
| 语种 | 英语 |
| 学科领域 | Astronomy & Astrophysics |
| 文章类型 | Article |
| ISSN | 0004-6264 |
| URL | 查看原文 |
| 归档日期 | 2010-07-13 |
| WOS记录号 | WOS:000279834900022 |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 关键词[WOS] | URSAE MAJORIS SYSTEMS ; EVOLUTIONARY POPULATION SYNTHESIS ; BINARY STARS ; WUMA-TYPE ; LUMINOSITY ; MODELS |
| EI入藏号 | 20215111360224 |
| EI主题词 | Photometry |
| EI分类号 | 641.3 Mass Transfer - 657.2 Extraterrestrial Physics and Stellar Phenomena - 714.2 Semiconductor Devices and Integrated Circuits - 941.4 Optical Variables Measurements |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/4511 |
| 专题 | 大样本恒星演化研究组 中国科学院天体结构与演化重点实验室 |
| 通讯作者 | Jiang, TY (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Yunnan Province, Peoples R China. |
| 作者单位 | 1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, Kunming, Yunnan Province 650011, P. R. China 2.Graduate University of Chinese Academy Sciences, Beijing 100039, P. R. China 3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, Yunnan Province 650011, P. R. China |
| 第一作者单位 | 中国科学院云南天文台 |
| 推荐引用方式 GB/T 7714 | Jiang TY,Li LF,Han ZW,et al. Photometric Investigation and Possible Light-Time Effect in the Orbital Period of a Marginal Contact System, CW Cassiopeiae[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2010,62(2):457-465. |
| APA | Jiang TY,Li LF,Han ZW,Jiang DK,&Jiang, TY .(2010).Photometric Investigation and Possible Light-Time Effect in the Orbital Period of a Marginal Contact System, CW Cassiopeiae.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,62(2),457-465. |
| MLA | Jiang TY,et al."Photometric Investigation and Possible Light-Time Effect in the Orbital Period of a Marginal Contact System, CW Cassiopeiae".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 62.2(2010):457-465. |
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