| 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.
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| 发表期刊 | PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
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| 2004-09 | |
| 卷号 | 116期号:823页码:826-832 |
| DOI | 10.1086/424003 |
| 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 |
| ISSN | 0004-6280 |
| 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 |
| 引用统计 | |
| 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 |
| 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 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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| 文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
| A CCD Photometric St（151KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | 浏览 请求全文 | |
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