Distribution and evolution of starspots on the RS CVn binary II Pegasi in 2004
文献类型：期刊论文
| 作者 | Xiang Y(项越)1,2,3 ; Gu SH(顾盛宏)1,2; Cameron, AC4; Barnes, JR5
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2014-03 |
| 卷号 | 438期号:3页码:2307-2316 |
| 关键词 | stars: activity binaries: close stars: imaging stars: individual: II Peg starspots |
| ISSN号 | 0035-8711 |
| 产权排序 | 第一完成单位 |
| 通讯作者 | Xiang, Y (reprint author), Chinese Acad Sci, Yunnan Observ, Kunming 650011, Peoples R China. |
| 英文摘要 | We present Doppler images of RS CVn-type binary II Peg based on two data sets obtained in 2004 February and November. In order to improve signal-to-noise ratio and reliability, we apply least-squares deconvolution technique to calculate average profiles from 2032 photospheric absorption lines. Both of the resulting surface images show a wide latitude distribution of starspots. Most spots are concentrated at a high-latitude belt above 60 degrees and a low-latitude belt near equator. The starspots evolved dramatically between two observing runs, which may indicate shorter time-scale evolution in this epoch, especially for low-latitude belt. There is no stable preferred active longitude that can be found in our images. We also find out a possible phenomenon that the intermediate-latitude spot migrated poleward and merged with the high-latitude spot to make it stronger, which may reveal a more complex behaviour of starspots on II Peg. A potential change of orbital ephemeris zero-point was detected. This may imply an orbital period change of II Peg like other active close binaries. |
| 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] | ORBITAL PERIOD MODULATION ; STELLAR SURFACE-STRUCTURE ; CANUM-VENATICORUM ; ACTIVE STARS ; DIFFERENTIAL ROTATION ; DOPPLER IMAGES ; SPOT ACTIVITY ; V711 TAURI ; HR 1099 ; ACTIVITY CYCLE |
| 收录类别 | SCI |
| 原文出处 | http://mnras.oxfordjournals.org/content/438/3/2307 |
| 语种 | 英语 |
| WOS记录号 | WOS:000331877000024 |
| 公开日期 | 2016-05-03 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/6801]  |
| 专题 | 云南天文台_系外行星研究组 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.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China 2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China 3.University of Chinese Academy of Sciences, Beijing 100049, China 4.School of Physics and Astronomy, University of St Andrews, Fife KY16 9SS, UK 5.Centre for Astrophysics Research, University of Hertfordshire, College Lane, Hatfield, Hertfordshire AL10 9AB, UK |
| 推荐引用方式 GB/T 7714 | Xiang Y,Gu SH,Cameron, AC,et al. Distribution and evolution of starspots on the RS CVn binary II Pegasi in 2004[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2014,438(3):2307-2316. |
| APA | Xiang Y,Gu SH,Cameron, AC,&Barnes, JR.(2014).Distribution and evolution of starspots on the RS CVn binary II Pegasi in 2004.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,438(3),2307-2316. |
| MLA | Xiang Y,et al."Distribution and evolution of starspots on the RS CVn binary II Pegasi in 2004".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 438.3(2014):2307-2316. |
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来源：云南天文台
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