Multiple color light curves and period changes investigation of the contact binary HV Aqr

	Multiple color light curves and period changes investigation of the contact binary HV Aqr
	Li K(李凯)1,2,3 ; Qian SB(钱声帮)1,2,3
刊名	NEW ASTRONOMY
	2013-07
卷号	21 页码:46-49
关键词	Stars: binaries: close Stars: binaries: eclipsing Stars: individuals: HV Aqr
ISSN号	1384-1076
通讯作者	Li, K (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	New V, R and I light curves of the short period binary system, HV Aqr, are presented. Photometric solutions were derived using the Wilson-Devinney code. Our new determined light curves do not show O'Connell effect. The nearly symmetry and complete eclipses of the light curves of HV Aqr enable us to determine high-precision photometric parameters of the binary system. The new solutions suggest that HV Aqr is a low mass ratio (q = 0.1455) deep contact binary with a contact degree off = 55.9%. Based on all available times of light minimum, we analyzed the long-term period changes of HV Aqr. A secular decrease rate of dP/dt = 8.84(+/- 0.18) x 10(-8) days yr(-1) was determined. The continuous period decrease can be explained by the mass transfer from the primary component to the secondary and angular momentum loss via magnetic stellar wind. A conservative mass transfer rate of dM(1)/dt = 1.81 x 10(-8)M(circle dot) yr(-1) and angular momentum loss rate at dJ/dt = 5.96 x 10(48) g cm(2) s(-1) yr(-1) were derived. As the orbital period decreases, the contact degree of HV Aqr will become deeper and finally it will evolve into a single rapid-rotation star. (C) 2012 Elsevier B.V. All rights reserved.
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]	URSAE MAJORIS SYSTEMS ; STARS
收录类别	SCI
原文出处	http://www.sciencedirect.com/science/article/pii/S1384107612001133
语种	英语
WOS记录号	WOS:000314558400008
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5886]
专题	云南天文台_双星与变星研究组云南天文台_中国科学院天体结构与演化重点实验室
作者单位	1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, PR China 2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences. Graduate School of the CAS, 100049 Beijing, PR China 3.Graduate School of the CAS, 100049 Beijing, PR China
推荐引用方式 GB/T 7714	Li K,Qian SB. Multiple color light curves and period changes investigation of the contact binary HV Aqr[J]. NEW ASTRONOMY,2013,21:46-49.
APA	Li K,&Qian SB.(2013).Multiple color light curves and period changes investigation of the contact binary HV Aqr.NEW ASTRONOMY,21,46-49.
MLA	Li K,et al."Multiple color light curves and period changes investigation of the contact binary HV Aqr".NEW ASTRONOMY 21(2013):46-49.