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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.
Source PublicationASTRONOMICAL JOURNAL
2005-03
Volume129Issue:3Pages:1686-1693
DOI10.1086/427852
Contribution Rank第1完成单位
Indexed BySCI
KeywordBinaries : Close Binaries : Eclipsing Stars : Evolution Stars : Individual (Ao Camelopardalis Am Leonis)
AbstractAO 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.
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN0004-6256
URL查看原文
Archive Date2005-02-28
WOS IDWOS:000227523100032
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordTHERMAL RELAXATION OSCILLATION ; W-URSAE-MAJORIS ; ECLIPSING BINARY ; ORBITAL PERIOD ; CONTACT BINARIES ; LIGHT CURVES ; CLOSE BINARIES ; CE-LEONIS ; MODULATION ; DRACONIS
Citation statistics
Cited Times:18[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5781
Collection双星与变星研究组
Corresponding AuthorQian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
Affiliation1.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
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
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,&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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