An abnormal radiant luminosity of the contact binary GZ Andromedae and its possible explanation

doi:10.1051/0004-6361:20030061

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	An abnormal radiant luminosity of the contact binary GZ Andromedae and its possible explanation
	Yang YL(杨毓兰)1,2 ; Liu QY(刘清耀)1,2 ; Yang, Y (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming, Yunnan, Peoples R China.
发表期刊	ASTRONOMY & ASTROPHYSICS
	2003-04
卷号	401 期号:2 页码:631-637
DOI	10.1051/0004-6361:20030061
产权排序	第1完成单位
收录类别	SCI ; EI
关键词	Stars : Binaries : Close Stars : Binaries : General
摘要	Complete BV light curves of the W UMa type binary GZ And is presented in this paper. From the present times of minimum light and those collected from the references, the changes in the orbital period of the system are analyzed. The result reveals that the orbital period of GZ And continuously increased at a period change rate of dp/p = 2.00 x 10(-10). The observed orbital period increase of GZ And may be explained by a mass transfer rate from the smaller to the larger component of Deltam = 1.05 x 10(-7) M-. yr(-1). The present light curves are analyzed by means of the latest version of the Wilson-Devinney code. The results suggest that GZ And is a W-subtype W UMa contact binary with a mass ratio of 0.511. The present photometric mass ratio is in agreement with that obtained spectroscopically by Lu & Rucinski ( 1999). Combining the present photometric solution with the spectroscopic orbital elements by Lu & Rucinski ( 1999), we give absolute dimensions of GZ And. The determined masses and radii of the components show that GZ And is an unevolved main-sequence binary, but the luminosity of the primary is abnormally low for the same mass main-sequence star. The low luminosity of the primary may be explained by transformation between gravitational energy and thermal energy of the system.
语种	英语
学科领域	Astronomy & Astrophysics
文章类型	Article
ISSN	0004-6361
URL	查看原文
归档日期	2003-11-04
WOS记录号	WOS:000181708800025
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	ORBITAL PERIOD ; Y-SEXTANTIS ; ECLIPSING BINARIES ; URSAE-MAJORIS ; LIGHT-CURVE ; V401 CYGNI ; STARS ; COMPONENTS ; SYSTEM ; BOOTIS
引用统计	被引频次：10[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/4165
专题	其他
通讯作者	Yang, Y (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming, Yunnan, Peoples R China.
作者单位	1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming, Yunnan, China 2.United Laboratory of Optical Astronomy, Chinese Academy of Sciences, China
第一作者单位	中国科学院云南天文台
推荐引用方式 GB/T 7714	Yang YL,Liu QY,Yang, Y . An abnormal radiant luminosity of the contact binary GZ Andromedae and its possible explanation[J]. ASTRONOMY & ASTROPHYSICS,2003,401(2):631-637.
APA	Yang YL,Liu QY,&Yang, Y .(2003).An abnormal radiant luminosity of the contact binary GZ Andromedae and its possible explanation.ASTRONOMY & ASTROPHYSICS,401(2),631-637.
MLA	Yang YL,et al."An abnormal radiant luminosity of the contact binary GZ Andromedae and its possible explanation".ASTRONOMY & ASTROPHYSICS 401.2(2003):631-637.

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