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HIGH FILL-OUT, EXTREME MASS RATIO OVERCONTACT BINARY SYSTEMS. VIII. EM PISCIUM
Qian SB(钱声帮)1,2,3; He JJ(何家佳)1,2,3; Soonthornthum, B4; Liu L(刘亮)1,2,3; Zhu LY(朱俐颖)1,2,3; Li LJ(李临甲)1,2,3; Liao WP(廖文萍)1,2,3; Dai ZB(戴智斌)1,2,3; Qian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
Source PublicationASTRONOMICAL JOURNAL
2008-11
Volume136Issue:5Pages:1940-1946
DOI10.1088/0004-6256/136/5/1940
Contribution Rank第1完成单位
Indexed BySCI
KeywordBinaries: Close Binaries: Eclipsing Stars: Evolution Stars: Individual (Em Piscium)
AbstractCCD photometric observations of the newly discovered close binary, EM Piscium, obtained from 2006 December 4 to 2008 January 7, are presented. The light curves are symmetric and show complete eclipses with an eclipse duration of 54 minutes. When comparing the present light curves with those published by Gonzalez-Rojas et al., it is found that the depths of the two minima of the light curve have been interchanged, and the positive O'Connell effect has disappeared. The symmetric light curves in R and I bands were analyzed with the 2003 version of the W - D code. It is found that EM Piscium is a high fill-out overcontact binary system (f = 95.3 +/- 2.7%) with an extreme mass ratio of q = 0.1487, suggesting that it is on the late evolutionary stage of late-type tidal-locked binaries. Based on the nine instances of light minimum that we determined and those published by previous investigators, it is discovered that the orbital period shows a cyclic period variation with a period of 3.3 years, while it undergoes a continuously rapid increase at a rate of d P/dt = +3.97 x 10(-6) days year(-1). The cyclic period reveals the presence of a tertiary companion, which may play an important role for the formation and evolution of the overcontact binary by drawing angular momentum from the central system via Kozai oscillation or a combination of Kozai cycle and tidal friction. The high fill-out, the extreme mass ratio, and the rapid period increase may suggest that the binary system is quickly evolving into a rapid-rotating single star.
Funding OrganizationYunnan Natural Science Foundation(2005A0059M) ; Chinese Natural Science Foundation(10573032, 10433030) ; National Key Fundamental Research(2007CB815406) ; Chinese Academy of Sciences(O8ZKY11001)
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN0004-6256
URL查看原文
Archive Date2008-10-15
WOS IDWOS:000260132500019
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordTHERMAL RELAXATION OSCILLATION ; LIGHT CURVES ; ECLIPSING BINARY ; ORBITAL PERIOD ; AM LEONIS ; DEEP ; BOOTIS ; CANCRI ; TAURI ; M67
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5807
Collection双星与变星研究组
Corresponding AuthorQian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan 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.United Laboratory of Optical Astronomy, Chinese Academy of Sciences, 100012 Beijing, China
3.Graduate School of the Chinese Academy of Sciences, Beijing, China
4.National Astronomical Research Institute of Thailand/Ministry of Science and Technology, Bangkok, Thailand
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Qian SB,He JJ,Soonthornthum, B,et al. HIGH FILL-OUT, EXTREME MASS RATIO OVERCONTACT BINARY SYSTEMS. VIII. EM PISCIUM[J]. ASTRONOMICAL JOURNAL,2008,136(5):1940-1946.
APA Qian SB.,He JJ.,Soonthornthum, B.,Liu L.,Zhu LY.,...&Qian, SB .(2008).HIGH FILL-OUT, EXTREME MASS RATIO OVERCONTACT BINARY SYSTEMS. VIII. EM PISCIUM.ASTRONOMICAL JOURNAL,136(5),1940-1946.
MLA Qian SB,et al."HIGH FILL-OUT, EXTREME MASS RATIO OVERCONTACT BINARY SYSTEMS. VIII. EM PISCIUM".ASTRONOMICAL JOURNAL 136.5(2008):1940-1946.
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