Deep, low mass ratio overcontact binary systems. V. The lowest mass ratio binary V857 Herculis
文献类型：期刊论文
| 作者 | Qian SB(钱声帮)1,2 ; Zhu LY(朱俐颖)1,2; Soonthornthum, B3; Yuan JZ(袁金照)1,2; Yang YG(杨远贵)1,2; He JJ(何家佳)1,2
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| 刊名 | ASTRONOMICAL JOURNAL
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| 出版日期 | 2005-09 |
| 卷号 | 130期号:3页码:1206-1211 |
| 关键词 | binaries : close binaries : eclipsing stars : evolution stars : individual ( V857 Herculis) |
| 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 | Charge-coupled device (CCD) photometric light curves in the B, V, and R bands of the complete eclipsing binary star V857 Her are presented. It is shown that the light curves of the W UMa-type binary are symmetric and of A type according to Binnendijk's classification. Our four epochs of light minimum along with others compiled from the literature were used to revise the period and study the period change. Weak evidence indicates that the orbital period of V857 Her may show a continuous increase at a rate of dP/dt = +2.90 x 10(-7) days yr(-1). The photometric parameters of the system were determined with the 2003 version of the Wilson-Devinney code. It is shown that V857 Her is a deep overcontact binary system with f = 83.8% +/- 5.1%. The derived mass ratio of q = 0.06532 +/- 0.0002 suggests that it has the lowest mass ratio among overcontact binary systems. As the orbital period increases, the decrease of the mass ratio will cause it to evolve into a single rapidly rotating star when it meets the more familiar criterion that the orbital angular momentum be less than 3 times the total spin angular momentum. To understand the evolutionary state of the system, long-term photometric monitoring and spectroscopic observations will be required. |
| 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] | LIMB-DARKENING COEFFICIENTS ; AW-URSAE-MAJORIS ; PARAMETERS ; STARS |
| 收录类别 | SCI |
| 原文出处 | http://iopscience.iop.org/1538-3881/130/3/1206/ |
| 语种 | 英语 |
| WOS记录号 | WOS:000231450900023 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/5777]  |
| 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.Department of Physics, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand |
| 推荐引用方式 GB/T 7714 | Qian SB,Zhu LY,Soonthornthum, B,et al. Deep, low mass ratio overcontact binary systems. V. The lowest mass ratio binary V857 Herculis[J]. ASTRONOMICAL JOURNAL,2005,130(3):1206-1211. |
| APA | Qian SB,Zhu LY,Soonthornthum, B,Yuan JZ,Yang YG,&He JJ.(2005).Deep, low mass ratio overcontact binary systems. V. The lowest mass ratio binary V857 Herculis.ASTRONOMICAL JOURNAL,130(3),1206-1211. |
| MLA | Qian SB,et al."Deep, low mass ratio overcontact binary systems. V. The lowest mass ratio binary V857 Herculis".ASTRONOMICAL JOURNAL 130.3(2005):1206-1211. |
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