BL Andromedae and GW Tauri: close binary stars in a key evolutionary stage | |
Zhu LY(朱俐颖)1,2,3; Qian SB(钱声帮)1,2 | |
发表期刊 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY |
2006-03-21 | |
卷号 | 367期号:1页码:423-432 |
DOI | 10.1111/j.1365-2966.2005.09963.x |
产权排序 | 第1完成单位 |
收录类别 | SCI ; EI |
关键词 | Binaries : Close Binaries : Eclipsing Stars : Evolution Stars : Individual : Bl Andromedae Stars : Individual : Gw Tauri |
摘要 | A photoelectric light curve of BL And is presented along with the first CCD light curve of GW Tau. Both objects are short-period eclipsing binaries and were observed in 2003 or 2004. Photometric elements were computed using the latest version of the Wilson-Van Hamme code. The results reveal that BL And is a semidetached system with the primary component filling its Roche lobe and the secondary one almost filling but still detached, while GW Tau is a marginal-contact binary system with a small degree of contact (f= 10.9 per cent) and a large temperature difference of about 3100 K. All available eclipse times, including new ones, were analysed for each system. It was found that the orbital period of BL And is decreasing at the rate of dP/dt=-2.36 x 10(-8) (+/- 0.09) d yr(-1) while that of GW Tau may be decreasing or oscillating. We think period decrease is more probable. The derived configuration and secular period decrease for BL And combined with the asymmetry of the light curve indicate that this system may evolve from the present semidetached phase into a contact stage, with mass transfer from the primary component to the secondary one through the L-1 point, or that it might just undergo the broken stage predicted by the theory of thermal relaxation oscillations. In contrast, GW Tau is a marginal-contact binary in poor thermal contact and may be at the beginning of the contact phase. |
语种 | 英语 |
学科领域 | 天文学 ; 恒星与银河系 ; 恒星形成与演化 |
学科门类 | 理学 ; 理学::天文学 |
文章类型 | Article |
出版者 | Blackwell Publishing Ltd |
ISSN | 0035-8711 |
URL | 查看原文 |
归档日期 | 2006-03-15 |
WOS记录号 | WOS:000235939700051 |
WOS研究方向 | Astronomy & Astrophysics |
WOS类目 | Astronomy & Astrophysics |
关键词[WOS] | URSAE MAJORIS SYSTEMS ; CONTACT BINARY ; PERIOD CHANGES ; BX-ANDROMEDAE ; LIGHT CURVES ; BO PEGASI ; PHOTOMETRY ; COMPONENTS ; VIRGINIS ; PHASE |
EI入藏号 | 20221411897073 |
EI主题词 | Mass transfer |
EI分类号 | 641.3 Mass Transfer - 657.2 Extraterrestrial Physics and Stellar Phenomena |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://ir.ynao.ac.cn/handle/114a53/5791 |
专题 | 双星与变星研究组 |
通讯作者 | Zhu LY(朱俐颖) |
作者单位 | 1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, 650011 Kunming, China 2.United Laboratory of Optical Astronomy, Chinese Academy of Sciences (ULOAC), 100012 Beijing, China 3.Graduate School of the Chinese Academy of Sciences 100012 Beijing, China |
第一作者单位 | 中国科学院云南天文台 |
通讯作者单位 | 中国科学院云南天文台 |
推荐引用方式 GB/T 7714 | Zhu LY,Qian SB. BL Andromedae and GW Tauri: close binary stars in a key evolutionary stage[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2006,367(1):423-432. |
APA | Zhu LY,&Qian SB.(2006).BL Andromedae and GW Tauri: close binary stars in a key evolutionary stage.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,367(1),423-432. |
MLA | Zhu LY,et al."BL Andromedae and GW Tauri: close binary stars in a key evolutionary stage".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 367.1(2006):423-432. |
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