Orbital period studies of three algols: TW And, RW Leo, and AY Vul
文献类型：期刊论文
| 作者 | Qian, SB |
| 刊名 | PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
 |
| 出版日期 | 2003 |
| 卷号 | 55期号:1页码:289-295 |
| 关键词 | stars : binaries : close stars : individuals (TW And, RW Leo AY Vul) stars : triple systems |
| ISSN号 | 0004-6264 |
| 英文摘要 | The changes in the orbital periods of three EA-type eclipsing binaries, TW And, RW Leo, and AY Vul, are discussed based on an analysis of their 0 - C curves. For RW Leo, its orbital period was revised and, assuming a cyclic oscillation in the orbital period, a period of 38.4 yr was determined. For the other two systems, TW And and AY Vul, their 0 - C diagrams show complex variations. Under the assumption of periodic oscillation, cyclic changes with periods of 56.4 and 78.6 yr were discovered to superimpose on upward parabolic changes, indicating a secular period increase. The secular period increases for the two binary systems indicate that they are on an active phase of mass transfer. Assuming the oscillations in the periods to be caused by light-time effects due to the presence of "third bodies" rotating around these binary stars, the orbital parameters of the third bodies were determined. For RW Leo, it is possible to detect an additional third body photometrically and spectroscopically. However, for the other two systems, TW And and AY Vul, it is less likely to see additional bodies, unless the orbital inclination is very small (i.e., i' < 30degrees). New photometric and spectroscopic observations and a careful analysis of those data are needed to check the presence of third bodies. |
| WOS关键词 | BINARIES ; CYGNI |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000181441500023 |
| 出版者 | ASTRONOMICAL SOC JAPAN |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/37436]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Qian, SB |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China 2.Chinese Acad Sci, United Lab Opt Astron, ULOAC, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Qian, SB. Orbital period studies of three algols: TW And, RW Leo, and AY Vul[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2003,55(1):289-295. |
| APA | Qian, SB.(2003).Orbital period studies of three algols: TW And, RW Leo, and AY Vul.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,55(1),289-295. |
| MLA | Qian, SB."Orbital period studies of three algols: TW And, RW Leo, and AY Vul".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 55.1(2003):289-295. |
入库方式： OAI收割
来源：国家天文台
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