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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.
发表期刊ASTRONOMICAL JOURNAL
2007-02
卷号133期号:2页码:357-363
DOI10.1086/509499
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 (Ap Leonis)
摘要New 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).
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2007-01-17
WOS记录号WOS:000243730000001
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]THERMAL RELAXATION OSCILLATION ; LIMB-DARKENING COEFFICIENTS ; URSAE MAJORIS SYSTEMS ; OVERCONTACT BINARY ; ORBITAL PERIOD ; CONTACT BINARIES ; MASS-RATIO ; STARS ; EVOLUTION ; MODULATION
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5801
专题双星与变星研究组
通讯作者Qian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming, Peoples R China.
作者单位1.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
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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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