The W Ursae Majoris system AK Herculis

	The W Ursae Majoris system AK Herculis
	Li LF(李立芳)1,2 ; Zhang FH(张奉辉)1,2 ; Han ZW(韩占文)1,2
刊名	ASTRONOMY & ASTROPHYSICS
	2001-03
卷号	368 期号:2 页码:595-600
关键词	individual star : AK Her binaries : eclipsing stars : activity
ISSN号	0004-6361
通讯作者	Li, LF (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Hunnan Province, Peoples R China.
产权排序	第一完成单位
英文摘要	A detailed study of the period and the light-curve of the eclipsing binary AK Her is presented. Based on the study of the (O-C) curve, we find that the period variation of the system contains a component of a long-term decrease, and three other components of periodical variation. Our result is very different from that of other investigators. We compare light curves: obtained by other groups and find that the light curve of the system has changed considerably. Based on the analysis, we investigate the physical mechanisms which may underlie the variations of the period and the light curve and obtain some new conclusions. According to the characteristics of rapid light variation of the system, we conclude that the rapid change is probably caused by pulsation of the common envelope, and that the physic-al mechanism causing the pulsation may be mass transfer between the two components. In addition, we find that the amplitude of the light curve variation is almost proportional to the rate of the period variation. Finally, the trends in the evolution of the system are discussed.
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]	ORBITAL PERIOD ; CONTACT BINARIES
收录类别	SCI ; EI
原文出处	http://www.aanda.org/articles/aa/abs/2001/11/aa10499/aa10499.html
语种	英语
WOS记录号	WOS:000168306200022
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4394]
专题	云南天文台_大样本恒星演化研究组
作者单位	1.Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, Kunming, Yunnan Province 650011, PR China 2.National Astronomical Observatories, Chinese Academy of Sciences, PR China
推荐引用方式 GB/T 7714	Li LF,Zhang FH,Han ZW. The W Ursae Majoris system AK Herculis[J]. ASTRONOMY & ASTROPHYSICS,2001,368(2):595-600.
APA	Li LF,Zhang FH,&Han ZW.(2001).The W Ursae Majoris system AK Herculis.ASTRONOMY & ASTROPHYSICS,368(2),595-600.
MLA	Li LF,et al."The W Ursae Majoris system AK Herculis".ASTRONOMY & ASTROPHYSICS 368.2(2001):595-600.