Absolute parameters and physical nature of two W-UMa type binaries: V1123 Tau and V1128 Tau

	Absolute parameters and physical nature of two W-UMa type binaries: V1123 Tau and V1128 Tau
	Zhang, XB1 ; Ren, AB 1,2; Luo CQ(罗常青)3 ; Luo YP(罗杨平)3
刊名	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2011-05
卷号	11 期号:5 页码:583-593
关键词	binaries: eclipsing stars: late-type stars: activity stars: individual (V1123 Tau, V1128 Tau)
ISSN号	1674-4527
通讯作者	Zhang, XB (reprint author), Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China.
产权排序	第三完成单位
英文摘要	We present high-precision, multi-band CCD photometry of two less-studied close binaries V1123 Tau and V1128 Tau. Complete covered light curves and a number of new times of light minima of the two eclipsing systems were obtained, based on which, revised orbital elements and new ephemerides were given. By adopting the Wilson-Devinney method, the light curves were analyzed. The photometric solutions confirm the W UMa-type nature of the binary systems. With the less-massive secondary slightly cooler than the primary, V1123 Tau could be classified as an A-type contact system. While V1128 Tau is typically considered a W-type W UMa star, the surface temperature of its secondary component is determined to be absolutely higher than the primary by about 270 K. Combining with the results of radial-velocity solutions, we determined absolute parameters of the two systems. The mass, radius and luminosity for each component of V1123 Tau were derived as: 1.36 +/- 0.05M(circle dot), 1.37 +/- 0.02R(circle dot), and 2.01 +/- 0.07L(circle dot) and 0.40 +/- 0.02M(circle dot), 0.80 +/- 0.01R(circle dot), and 0.67 +/- 0.04L(circle dot), respectively. For V1128 Tau, the absolute parameters were computed to be 1.09 +/- 0.03M(circle dot), 1.01 +/- 0.01R(circle dot), and 1.34 +/- 0.06L(circle dot) and 0.58 +/- 0.01M(circle dot), 0.76 +/- 0.01R(circle dot), and 0.91 +/- 0.05L(circle dot), respectively. Based on these results, the evolutionary status and the physical nature of the two binary systems are discussed, while also connecting with the theoretical models.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	LIGHT CURVES ; STAR LIGHT ; PHOTOMETRY ; VELOCITY ; SYSTEMS
收录类别	SCI
原文出处	http://iopscience.iop.org/article/10.1088/1674-4527/11/5/008/meta
语种	英语
WOS记录号	WOS:000290844200008
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5208]
专题	云南天文台_恒星物理研究组
作者单位	1.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China 2.Institute of Theoretical Physics, China West Normal University, Nanchong 637002, China 3.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China
推荐引用方式 GB/T 7714	Zhang, XB,Ren, AB,Luo CQ,et al. Absolute parameters and physical nature of two W-UMa type binaries: V1123 Tau and V1128 Tau[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2011,11(5):583-593.
APA	Zhang, XB,Ren, AB,Luo CQ,&Luo YP.(2011).Absolute parameters and physical nature of two W-UMa type binaries: V1123 Tau and V1128 Tau.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,11(5),583-593.
MLA	Zhang, XB,et al."Absolute parameters and physical nature of two W-UMa type binaries: V1123 Tau and V1128 Tau".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 11.5(2011):583-593.