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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; Zhu, LY (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2006-03-21
卷号367期号:1页码:423-432
DOI10.1111/j.1365-2966.2005.09963.x
产权排序第1完成单位
收录类别SCI
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Astronomy & Astrophysics
文章类型Article
ISSN0035-8711
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
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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 (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
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
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Zhu LY,Qian SB,Zhu, LY . 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,&Zhu, LY .(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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