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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.
发表期刊ASTRONOMICAL JOURNAL
2007-10
卷号134期号:4页码:1475-1482
DOI10.1086/521432
产权排序第1完成单位
收录类别SCI
关键词Binaries : Close Binaries : Eclipsing Open Clusters And Associations : Individual (Ngc 752) Stars : Evolution Stars : Individual (Qx Andromedae)
摘要QX 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.
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2007-12-20
WOS记录号WOS:000249781800016
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]THERMAL RELAXATION OSCILLATION ; URSAE MAJORIS SYSTEMS ; CONTACT BINARIES ; NGC 752 ; ECLIPSING BINARY ; RADIAL-VELOCITY ; ORBITAL PERIOD ; LIGHT CURVES ; STARS ; EVOLUTION
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5798
专题双星与变星研究组
通讯作者Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
作者单位1.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
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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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