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Deep, low mass ratio overcontact binary systems. VII. QX Andromedae in the intermediate-age open cluster NGC 752
Qian SB(钱声帮)1,2,3; Liu L(刘亮)1,2,3; Soonthornthum, B4; Zhu LY(朱俐颖)1,2,3; He JJ(何家佳)1,2,3; Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
Source PublicationASTRONOMICAL JOURNAL
2007-10
Volume134Issue:4Pages:1475-1482
DOI10.1086/521432
Contribution Rank第1完成单位
Indexed BySCI
KeywordBinaries : Close Binaries : Eclipsing Open Clusters And Associations : Individual (Ngc 752) Stars : Evolution Stars : Individual (Qx Andromedae)
AbstractQX Andromedae is a short- period eclipsing binary in the intermediate- age open cluster NGC 752. Charge- coupled device photometric observations of the close binary system obtained from 2004 November 13 to 2006 November 18 are presented. It is confirmed that the light curves show partial eclipses, and night-to- night intrinsic variations are seen. As in the case of AH Cancri in the old open cluster M67, the light curve of QX And seems to change between A and W types. Both the short- and long-term light variations suggest that QX And shows strong magnetic activity, which is in agreement with its X- ray observations. The symmetric light curves in B and V bands obtained the night of 2004 November 13 were analyzed with the new version of the W- D code. It is found that QX And is a deep overcontact binary system with a high degree of overcontact of f = 55.9% and a low mass ratio of q = 0.2327, suggesting that it is in the late stage of overcontact evolution. Based on our 23 times of light minimum, including four recently published eclipse times, the orbital period of the eclipsing binary was revised. It was discovered that the orbital period shows a continuous period increase at a rate of dP/dt =+2.48x10(-7) days yr(-1), which can be interpreted as a mass transfer from the less massive component to the more massive one. As the period increases, the mass ratio of the system will decrease. It may finally evolve into a rapid- rotating single star when it meets the more familiar criterion that the orbital angular momentum is less than 3 times the total spin angular momentum. The existence of QX And in the late evolutionary stage of an overcontact binary in the intermediate- age open cluster NGC 752 indicates that it may undergo strong cluster stellar interaction. This means it had a very short initial orbital period and could have evolved into the present evolutionary state within the cluster age. By comparing with the evolutionary state of TX Cnc in M44, it is estimated that the lifetime of overcontact binaries may be no less than 1 Gyr.
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN0004-6256
URL查看原文
Archive Date2007-12-20
WOS IDWOS:000249781800016
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordTHERMAL RELAXATION OSCILLATION ; URSAE MAJORIS SYSTEMS ; CONTACT BINARIES ; NGC 752 ; ECLIPSING BINARY ; RADIAL-VELOCITY ; ORBITAL PERIOD ; LIGHT CURVES ; STARS ; EVOLUTION
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Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5798
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.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,Liu L,Soonthornthum, B,et al. Deep, low mass ratio overcontact binary systems. VII. QX Andromedae in the intermediate-age open cluster NGC 752[J]. ASTRONOMICAL JOURNAL,2007,134(4):1475-1482.
APA Qian SB,Liu L,Soonthornthum, B,Zhu LY,He JJ,&Qian, SB .(2007).Deep, low mass ratio overcontact binary systems. VII. QX Andromedae in the intermediate-age open cluster NGC 752.ASTRONOMICAL JOURNAL,134(4),1475-1482.
MLA Qian SB,et al."Deep, low mass ratio overcontact binary systems. VII. QX Andromedae in the intermediate-age open cluster NGC 752".ASTRONOMICAL JOURNAL 134.4(2007):1475-1482.
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