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Distribution and evolution of starspots on the RS CVn binary II Pegasi in 2004
Xiang Y(项越)1,2,3; Gu SH(顾盛宏)1,2; Cameron, AC4; Barnes, JR5
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2014-03
卷号438期号:3页码:2307-2316
DOI10.1093/mnras/stt2345
产权排序第1完成单位
收录类别SCI
关键词Stars: Activity Binaries: Close Stars: Imaging Stars: Individual: Ii Peg Starspots
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.

资助项目National Natural Science Foundation of China[10373023] ; National Natural Science Foundation of China[10773027] ; National Natural Science Foundation of China[11333006] ; Chinese Academy of Sciences[KJCX2-YW-T24]
项目资助者National Natural Science Foundation of China[10373023, 10773027, 11333006] ; Chinese Academy of Sciences[KJCX2-YW-T24]
语种英语
学科领域天文学 ; 恒星与银河系 ; 恒星天文学 ; 恒星形成与演化
学科门类理学 ; 理学::天文学
文章类型Article
出版者OXFORD UNIV PRESS
出版地GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
ISSN0035-8711
URL查看原文
归档日期2014-03-12
WOS记录号WOS:000331877000024
WOS研究方向Astronomy & Astrophysics
WOS类目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
引用统计
被引频次:4[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6801
专题系外行星研究组
中国科学院天体结构与演化重点实验室
通讯作者Xiang Y(项越)
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
第一作者单位中国科学院云南天文台
通讯作者单位中国科学院云南天文台
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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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