Are the W Ursae majoris-type systems EK comae berenices and UX Eridani surrounded by circumstellar matter?
文献类型：期刊论文
| 作者 | Li LF(李立芳) ; Zhang FH(张奉辉)
|
| 刊名 | NEW ASTRONOMY
 |
| 出版日期 | 2006-07 |
| 卷号 | 11期号:8页码:588-593 |
| ISSN号 | 1384-1076 |
| 关键词 | stars : binaries eclipsing circumstellar matter individual (EK Comae Berenices and UX Eridani) stars : activity stars : evolution |
| 通讯作者 | Li, LF (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 | The variations of the orbital periods of two nearly neglected W UMa-type eclipsing binaries, EK Comae Berenices and UX Eridani, are presented through a detailed analysis of the O-C diagrams. It is found that the orbital period of EK Com is decreasing and the period of UX Eridani is increasing, and several sudden jumps have occurred in the orbital periods of both binaries. We analyze the mechanism(s), which might underlie the changes of the orbital periods of both systems, and obtain some new results. The long-term decrease of the orbital period of EK Comae Berenices might be caused by the decrease of the orbital angular momentum due to a magnetic stellar wind (MSW) or by mass transfer from the more massive to the less massive component. The secular increase in the orbital period of UX Eridani might be caused by mass transfer from the less massive to the more massive star. The possible mechanisms, which underlie the sudden changes in the orbital periods of the close binary systems are as the followings: (1) the variations of the structure due to the variation of the magnetic field; (2) the rapid mass exchange between the close binaries and their circumstellar matter. Finally, the evolutionary status of the systems EK Comae Berenices and UX Eridani is discussed. (c) 2006 Elsevier B.V. All rights reserved. |
| 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] | BINARY-SYSTEMS ; PERIOD ; PARAMETERS ; STARS |
| 收录类别 | SCI ; EI |
| 原文出处 | http://www.sciencedirect.com/science/article/pii/S1384107606000340 |
| 语种 | 英语 |
| WOS记录号 | WOS:000238543000006 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/4428]  |
| 专题 | 云南天文台_大样本恒星演化研究组 |
| 作者单位 | National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Stellar evolution, P.O. Box 110, Kunming, Yunnan Province 650011, PR China |
| 推荐引用方式 GB/T 7714 | Li LF,Zhang FH. Are the W Ursae majoris-type systems EK comae berenices and UX Eridani surrounded by circumstellar matter?[J]. NEW ASTRONOMY,2006,11(8):588-593. |
| APA | Li LF,&Zhang FH.(2006).Are the W Ursae majoris-type systems EK comae berenices and UX Eridani surrounded by circumstellar matter?.NEW ASTRONOMY,11(8),588-593. |
| MLA | Li LF,et al."Are the W Ursae majoris-type systems EK comae berenices and UX Eridani surrounded by circumstellar matter?".NEW ASTRONOMY 11.8(2006):588-593. |
入库方式： OAI收割
来源：云南天文台
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