中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Starspot evolution, differential rotation, and correlation between chromospheric and photospheric activities on Kepler-411

文献类型:期刊论文

作者Xu FK(徐甫坤)1,2; Gu SH(顾盛宏)1,2,3; Ioannidis, Panogiotis4
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2021-02-01
卷号501期号:2页码:1878-1890
ISSN号0035-8711
关键词stars: chromospheres stars: magnetic field stars: rotation starspots
DOI10.1093/mnras/staa3793
产权排序第1完成单位
文献子类Article
英文摘要

We present an analysis of the starspot evolution, the surface differential rotation (SDR), the correlation between chromospheric activity indicators and the spatial connection between chromospheric and photospheric activities on the active star Kepler-411, using time-series photometry over four years fromKepler, and spectroscopic data fromKeck I 10-m and Lijiang 2.4-m telescopes. We constructed the light curve (LC) by re-performing photometry and reduction from the Target Pixel Files and Cotrending Basis Vectors with a manually redefined aperture using the software PYKE3. An efficient program, GEMC LCM, was developed to apply a two-spots model to chosen LC segments with three spot groups at fixed latitudes (30 degrees, 45 degrees), (30 degrees, 60 degrees) and (45 degrees, 60 degrees). We found a periodic variation of the starspots at the period of about 660 d which independs on spot latitudes, and estimated the lower limit of SDR rate alpha = 0.1016(0.0023) and equatoral rotation period P-eq = 9.7810(0.0169) d. Simultaneously, the relative variations of chromospheric activity indicators were derived by subtracting the overall mean spectrum from individual spectrum. It is found that Ca II H and K emissions are strongly correlated with each other, and there also exists a correlation between H alpha and Ca II H & K emissions, with large dispersion, in accordance with previous results. Furthermore, we find the correlation between Ca II H and K emissions is different in 2011 and 2012. The chromospheric emission variation shows a highly spatial anticorrelation with the LC, suggesting a spatial connection between the chromospheric active region and spot region.

学科主题天文学 ; 恒星与银河系 ; 恒星形成与演化
URL标识查看原文
出版地GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
WOS关键词FLUX MEASUREMENTS ; ERROR-CORRECTION ; MODEL ; ALGORITHMS ; TRANSITS ; MISSION ; SOLAR ; SPOTS ; FIELD
资助项目Chinese Academy of Sciences ; People's Government of Yunnan Province ; Association of Universities for Research in Astronomy, Inc., under NASA[NAS5-26555] ; NASA Science Mission directorate ; National Natural Science Foundation of China[10373023] ; National Natural Science Foundation of China[10773027] ; National Natural Science Foundation of China[11333006] ; National Natural Science Foundation of China[U1531121] ; Sino-German Center for Research Promotion[GZ1419]
WOS研究方向Astronomy & Astrophysics
语种英语
出版者OXFORD UNIV PRESS
WOS记录号WOS:000608475600023
资助机构Chinese Academy of Sciences ; People's Government of Yunnan Province ; Association of Universities for Research in Astronomy, Inc., under NASA[NAS5-26555] ; NASA Science Mission directorate ; National Natural Science Foundation of China[10373023, 10773027, 11333006, U1531121] ; Sino-German Center for Research Promotion[GZ1419]
源URL[http://ir.ynao.ac.cn/handle/114a53/24124]  
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
通讯作者Xu FK(徐甫坤); Gu SH(顾盛宏)
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, China
3.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 101408, China
4.Hamburger Sternwarte, Universitat Hamburg, Gojenbergsweg 112, D-21029 Hamburg, Germany
推荐引用方式
GB/T 7714
Xu FK,Gu SH,Ioannidis, Panogiotis. Starspot evolution, differential rotation, and correlation between chromospheric and photospheric activities on Kepler-411[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2021,501(2):1878-1890.
APA Xu FK,Gu SH,&Ioannidis, Panogiotis.(2021).Starspot evolution, differential rotation, and correlation between chromospheric and photospheric activities on Kepler-411.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,501(2),1878-1890.
MLA Xu FK,et al."Starspot evolution, differential rotation, and correlation between chromospheric and photospheric activities on Kepler-411".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 501.2(2021):1878-1890.

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来源:云南天文台

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