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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
Qian SB(钱声帮)1,2; He JJ(何家佳)1,2; Xiang, FY3; Ding, XY4; Boonrucksar, S5; Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊ASTRONOMICAL JOURNAL
2005-03
卷号129期号:3页码:1686-1693
DOI10.1086/427852
产权排序第1完成单位
收录类别SCI
关键词Binaries : Close Binaries : Eclipsing Stars : Evolution Stars : Individual (Ao Camelopardalis Am Leonis)
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.
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-6256
URL查看原文
归档日期2005-02-28
WOS记录号WOS:000227523100032
WOS研究方向Astronomy & Astrophysics
WOS类目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
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5781
专题双星与变星研究组
通讯作者Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
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
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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,&Qian, SB .(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.
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