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A CCD photometric study of the WUMa-type binary system EZ Hydrae
Yang YG(杨远贵)1,3,4; Qian SB(钱声帮)1,3; Zhu, CH2; Yang, YG (reprint author), Chinese Acad Sci ULOAC, United Lab Opt Astron, Beijing, Peoples R China.
发表期刊PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
2004-09
卷号116期号:823页码:826-832
DOI10.1086/424003
产权排序第1完成单位
收录类别SCI
摘要New complete CCD light curves in B and V bands for EZ Hya are presented in this paper. The first photometric spectroscopic solution for this system was obtained by using the latest version of the Wilson-Devinney program. The orbital inclination of 83.degrees3(+/-0.degrees6) confirms that this system is a total eclipsing binary system. Our solution indicates that EZ Hya is W-type overcontact binary with a small mass ratio of q = 0.257(+/-0.001) and an overcontact degree of f = 34.2%. Combining our light curves with the radial velocity curves from King & Hilditch, we were able to give the absolute parameters of this system: a = 2.98 (+/-0.61) R-., R-1 = 1.54(+/- 0.32) R-., R-2 = 0.85(+/-0.18) R-., M-1 = 1.37(+/-0.12) M-., and M-2 = 0.35(+/- 0.03) M-.. A period analysis using all photoelectric and CCD times of minimum light suggests an oscillation period of 30.9( +/- 0.61) yr and an amplitude of 0.0185( +/- 0.0012) days. The sinusoidal change can be explained either by the presence of an unseen third body or as the result of magnetic activity cycles of both components.
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-6280
URL查看原文
归档日期2004-09-03
WOS记录号WOS:000223641100004
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]ORBITAL PERIOD MODULATION ; CLOSE-BINARY ; CONTACT ; STARS ; HYA
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5769
专题双星与变星研究组
通讯作者Yang, YG (reprint author), Chinese Acad Sci ULOAC, United Lab Opt Astron, Beijing, Peoples R China.
作者单位1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, China
2.Department of Physics, Xinjiang University, Ulumqi, China
3.United Laboratory of Optical Astronomy, Chinese Academy of Sciences
4.Graduate School of the Chinese Academy of Sciences, Beijing, China
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Yang YG,Qian SB,Zhu, CH,et al. A CCD photometric study of the WUMa-type binary system EZ Hydrae[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC,2004,116(823):826-832.
APA Yang YG,Qian SB,Zhu, CH,&Yang, YG .(2004).A CCD photometric study of the WUMa-type binary system EZ Hydrae.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC,116(823),826-832.
MLA Yang YG,et al."A CCD photometric study of the WUMa-type binary system EZ Hydrae".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC 116.823(2004):826-832.
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