Period changes of AO Camelopardalis and AM Leonis and their implications for the presence of tertiary components and the evolutionary states of the two overcontact binary systems
文献类型：期刊论文
| 作者 | Qian SB(钱声帮)1,2 ; He JJ(何家佳)1,2; Xiang, FY3; Ding, XY4; Boonrucksar, S5
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| 刊名 | ASTRONOMICAL JOURNAL
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| 出版日期 | 2005-03 |
| 卷号 | 129期号:3页码:1686-1693 |
| ISSN号 | 0004-6256 |
| 关键词 | binaries : close binaries : eclipsing stars : evolution stars : individual (AO Camelopardalis, AM Leonis) |
| 通讯作者 | Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China. |
| 产权排序 | 第一完成单位 |
| 英文摘要 | AO Cam and AM Leo are two short-period overcontact binary systems whose physical properties are nearly the same. In the present paper, three CCD times of minimum light for AO Cam and two photoelectric eclipse times for AM Leo are presented. Combining the new determined eclipse times with others compiled from the literature, the behavior of their O - C variations were investigated. For AO Cam, its orbital period is revised, and it is found that the period shows a cyclic variation with a period of 20.1 yr and an amplitude of 0.0047 days. In AM Leo, a new period increase has occurred recently. Two possibilities of period variations, sudden and continuous changes, are discussed. The period changes of both systems cannot be explained by apsidal motion, since both the primary and the secondary eclipse times vary in the same O - C trend. Of the three mechanisms of magnetic activity cycles, internal mass motions, and the presence of a third body, we think that the last is more plausible. Assuming that the period changes are due to third bodies revolving around the eclipsing pairs, the parameters of the third-component stars are determined. If it exists, the third body in AO Cam is revolving in a circular orbit, whereas that in AM Leo is revolving in an eccentric orbit (e' = 0:58). No secular period changes were discovered in either overcontact binary star, which is in agreement with the recent statistical relation of Qian. This may suggest that AO Cam and AM Leo are in transition between the angular momentum loss - controlled and the thermal relaxation oscillation-controlled stages of the evolutionary scheme recently proposed by Qian. |
| 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 ; W-URSAE-MAJORIS ; ECLIPSING BINARY ; ORBITAL PERIOD ; CONTACT BINARIES ; LIGHT CURVES ; CLOSE BINARIES ; CE-LEONIS ; MODULATION ; DRACONIS |
| 收录类别 | SCI |
| 原文出处 | http://iopscience.iop.org/1538-3881/129/3/1686/ |
| 语种 | 英语 |
| WOS记录号 | WOS:000227523100032 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/5781]  |
| 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, P.O. Box 110, 650011 Kunming, China 2.Also at United Laboratory of Optical Astronomy, Chinese Academy of Sciences, 100012 Beijing, China 3.Department of Physics, Xiangtan University, 411105 Xiangtan, Funan, China 4.Bijie County Second Middle School, 551700 Bijie, Guizhou, China 5.Department of Physics, Chiang Mai University, 50200 Chiang Mai, Thailand |
| 推荐引用方式 GB/T 7714 | Qian SB,He JJ,Xiang, FY,et al. Period changes of AO Camelopardalis and AM Leonis and their implications for the presence of tertiary components and the evolutionary states of the two overcontact binary systems[J]. ASTRONOMICAL JOURNAL,2005,129(3):1686-1693. |
| APA | Qian SB,He JJ,Xiang, FY,Ding, XY,&Boonrucksar, S.(2005).Period changes of AO Camelopardalis and AM Leonis and their implications for the presence of tertiary components and the evolutionary states of the two overcontact binary systems.ASTRONOMICAL JOURNAL,129(3),1686-1693. |
| MLA | Qian SB,et al."Period changes of AO Camelopardalis and AM Leonis and their implications for the presence of tertiary components and the evolutionary states of the two overcontact binary systems".ASTRONOMICAL JOURNAL 129.3(2005):1686-1693. |
入库方式： OAI收割
来源：云南天文台
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