Deep, low mass ratio overcontact binary systems. VII. QX Andromedae in the intermediate-age open cluster NGC 752
文献类型：期刊论文
| 作者 | 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
|
| 刊名 | ASTRONOMICAL JOURNAL
 |
| 出版日期 | 2007-10 |
| 卷号 | 134期号:4页码:1475-1482 |
| 关键词 | binaries : close binaries : eclipsing open clusters and associations : individual (NGC 752) stars : evolution stars : individual (QX Andromedae) |
| ISSN号 | 0004-6256 |
| 产权排序 | 第一完成单位 |
| 通讯作者 | Qian, SB (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China. |
| 英文摘要 | 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. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | 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 |
| 收录类别 | SCI |
| 原文出处 | http://iopscience.iop.org/1538-3881/134/4/1475/ |
| 语种 | 英语 |
| WOS记录号 | WOS:000249781800016 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/5798]  |
| 专题 | 云南天文台_双星与变星研究组 |
| 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 |
| 推荐引用方式 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.(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. |
入库方式： OAI收割
来源：云南天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。