Variation of the period and light curves of the solar-type contact binary EQ Tauri
文献类型：期刊论文
| 作者 | Yuan JZ(袁金照)1,2 ; Qian SB(钱声帮)1,2
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2007-10-21 |
| 卷号 | 381期号:2页码:602-610 |
| 关键词 | binaries : close stars : evolution stars : individual : EQ Tauri stars : magnetic fields stars : spots |
| ISSN号 | 0035-8711 |
| 产权排序 | 第一完成单位 |
| 通讯作者 | Yuan, JZ (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China. |
| 英文摘要 | We present two new sets of complete light curves of EQ Tauri (EQ Tau) observed in 2000 October and 2004 December. These were analysed, together with the light curves obtained by Yang & Liu in 2001 December, with the 2003 version of the Wilson-Devinney code. In the three observing seasons, the light curves show a noticeable variation in the time-scale of years. The more massive component of EQ Tau is a solar-type star (G2) with a very deep convective envelope, which rotates about 80 times as fast as the Sun. Therefore, the change can be explained by dark-spot activity on the common convective envelope. The assumed unperturbed part of the light curve and the radial velocities published by Rucinski et al. were used to determine the basic parameters of the system, which were kept fixed for spot modelling in the three sets of light curves. The results reveal that the total spotted area on the more massive component covers 18, 3 and 20 per cent of the photospheric surface in the three observing seasons, respectively. Polar spots and high-latitude spots are found. The analysis of the orbital period has demonstrated that it undergoes cyclical oscillation, which is due to either a tertiary component or periodic magnetic activity in the more massive component. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | CLOSE BINARIES ; YY-CRB ; PARAMETERS ; MODULATION ; VELOCITY ; SYSTEMS ; PEGASI ; STARS ; SPOT |
| 收录类别 | SCI |
| 原文出处 | http://mnras.oxfordjournals.org/content/381/2/602 |
| 语种 | 英语 |
| WOS记录号 | WOS:000250273600011 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/5797]  |
| 专题 | 云南天文台_双星与变星研究组 |
| 作者单位 | 1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, 650011 Kunming, China 2.United Laboratory of Optical Astronomy, Chinese Academy of Sciences (ULOAC), 100012 Beijing, China |
| 推荐引用方式 GB/T 7714 | Yuan JZ,Qian SB. Variation of the period and light curves of the solar-type contact binary EQ Tauri[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2007,381(2):602-610. |
| APA | Yuan JZ,&Qian SB.(2007).Variation of the period and light curves of the solar-type contact binary EQ Tauri.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,381(2),602-610. |
| MLA | Yuan JZ,et al."Variation of the period and light curves of the solar-type contact binary EQ Tauri".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 381.2(2007):602-610. |
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来源：云南天文台
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