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A new CCD photometric investigation of the short-period close binary AP Leonis
Qian SB(钱声帮)1,2; Xiang, FY3; Zhu LY(朱俐颖)1,2; Dai ZB(戴智斌)1,2; He JJ(何家佳)1,2; Yuan JZ(袁金照)1,2; Qian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming, Peoples R China.
Source PublicationASTRONOMICAL JOURNAL
2007-02
Volume133Issue:2Pages:357-363
DOI10.1086/509499
Contribution Rank第1完成单位
Indexed BySCI
KeywordBinaries : Close Binaries : Eclipsing Stars : Evolution Stars : Individual (Ap Leonis)
AbstractNew CCD photometric light curves in the B, V, and R bands of the short-period close binary AP Leonis are presented. A photometric analysis with our symmetric light curves suggests that AP Leo is an overcontact binary with a degree of overcontact of 24.9%. Since the O - C values of photographic and visual times of light minimum showed a large scatter (up to 0.06 days), all of the period changes proposed for the eclipsing binary by previous investigators are not reliable. In this paper the orbital period changes of AP Leo are analyzed based on all published CCD and photoelectric eclipse times. A small-amplitude cyclic oscillation, with a period of 22.4 yr and an amplitude of 0.0049 days, is discovered to be superposed on a secular period decrease at a rate of dP/dt = - 1:08; 10(-7) days yr(-1). The continuous period decrease may be caused by angular momentum loss or a combination of the mass transfer from the primary to the secondary and angular momentum loss. The cyclic period change may indicate that AP Leo is a triple system containing a cool dwarf third component. If this is true, it is possible that this third component plays an important role in the origin and evolution of the overcontact system by removing angular momentum from the central system, and that it makes the eclipsing pair have a low angular momentum and a short initial orbital period ( e. g., P < 5 days). In that case, the initially detached system evolves into an overcontact configuration via magnetic torques from stellar winds. On the other hand, the rapid rotation of the solar-type components (spectral type G0) and the variations of the light curve indicate a high degree of magnetic activity from the spin-up of the components. Both the long-term period decrease and the oscillation can plausibly be interpreted by magnetic activity (i.e., enhanced magnetic stellar wind and activity cycles).
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN0004-6256
URL查看原文
Archive Date2007-01-17
WOS IDWOS:000243730000001
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordTHERMAL RELAXATION OSCILLATION ; LIMB-DARKENING COEFFICIENTS ; URSAE MAJORIS SYSTEMS ; OVERCONTACT BINARY ; ORBITAL PERIOD ; CONTACT BINARIES ; MASS-RATIO ; STARS ; EVOLUTION ; MODULATION
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Cited Times:34[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5801
Collection双星与变星研究组
Corresponding AuthorQian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming, Peoples R China.
Affiliation1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming, China
2.United Laboratory of Optical Astronomy, Chinese Academy of Sciences, Beijing, China
3.Physics Department, Xiangtan University, Xiangtan, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Qian SB,Xiang, FY,Zhu LY,et al. A new CCD photometric investigation of the short-period close binary AP Leonis[J]. ASTRONOMICAL JOURNAL,2007,133(2):357-363.
APA Qian SB.,Xiang, FY.,Zhu LY.,Dai ZB.,He JJ.,...&Qian, SB .(2007).A new CCD photometric investigation of the short-period close binary AP Leonis.ASTRONOMICAL JOURNAL,133(2),357-363.
MLA Qian SB,et al."A new CCD photometric investigation of the short-period close binary AP Leonis".ASTRONOMICAL JOURNAL 133.2(2007):357-363.
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