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 |
DOI | 10.1093/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. |
入库方式: OAI收割
来源:云南天文台
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