Observing the changing surface structures of the active K giant sigma Geminorum with SONG
文献类型:期刊论文
作者 | Korhonen, H.1; Roettenbacher, R. M.2; Gu SH(顾盛宏)3,4,5; Grundahl, F.6; Andersen, M. F.6; Henry, G. W.7; Jessen-Hansen, J.6; Antoci, V.6,8; Palle, P. L.9,10 |
刊名 | ASTRONOMY & ASTROPHYSICS |
出版日期 | 2021-02-01 |
卷号 | 646页码:11 |
ISSN号 | 0004-6361 |
关键词 | stars: activity stars: late-type stars: rotation starspots stars: individual: sigma Geminorum |
DOI | 10.1051/0004-6361/202038799 |
产权排序 | 第3完成单位 |
文献子类 | Article |
英文摘要 | Aims. We aim to study the spot evolution and differential rotation in the magnetically active cool K-type giant star sigma Gem from broadband photometry and continuous spectroscopic observations that span 150 nights.Methods. We use high-resolution, high signal-to-noise ratio spectra obtained with the Hertzsprung SONG telescope to reconstruct surface (photospheric) temperature maps with Doppler imaging techniques. The 303 observations span 150 nights and allow for a detailed analysis of the spot evolution and surface differential rotation. The Doppler imaging results are compared to simultaneous broadband photometry from the Tennessee State University T3 0.4 m Automated Photometric Telescope. The activity from the stellar chromosphere, which is higher in the stellar atmosphere, is also studied using SONG observations of Balmer H alpha line profiles and correlated with the photospheric activity.Results. The temperature maps obtained during eight consecutive stellar rotations show mainly high-latitude or polar spots, with the main spot concentrations above latitude 45 degrees. The spots concentrate around phase 0.25 near the beginning of our observations and around phase 0.75 towards the end. The photometric observations confirm a small jump in spot phases that occurred in February 2016. The cross-correlation of the temperature maps reveals rather strong solar-like differential rotation, giving a relative surface differential rotation coefficient of alpha = 0.10 +/- 0.02. There is a weak correlation between the locations of starspots and enhanced emission in the chromosphere at some epochs. |
学科主题 | 天文学 ; 恒星与银河系 ; 恒星天文学 ; 恒星形成与演化 |
URL标识 | 查看原文 |
出版地 | 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE |
WOS关键词 | FK COMAE BERENICES ; DIFFERENTIAL ROTATION ; FLIP-FLOP ; STARS ; LONGITUDES ; CYCLES ; SPOT ; SPECTROSCOPY ; ANDROMEDAE ; FLARE |
资助项目 | Yale Center for Astronomy & Astrophysics (YCAA) Prize Postdoctoral Fellowship ; 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] ; NASA ; NSF ; Tennessee State University ; State of Tennessee Centers of Excellence program ; VILLUM FONDEN[00028173] ; Danish National Research Foundation[DNRF106] |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | EDP SCIENCES S A |
WOS记录号 | WOS:000616488000001 |
资助机构 | Yale Center for Astronomy & Astrophysics (YCAA) Prize Postdoctoral Fellowship ; National Natural Science Foundation of China[10373023, 10773027, 11333006, U1531121] ; NASA ; NSF ; Tennessee State University ; State of Tennessee Centers of Excellence program ; VILLUM FONDEN[00028173] ; Danish National Research Foundation[DNRF106] |
源URL | [http://ir.ynao.ac.cn/handle/114a53/24188] |
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 | Korhonen, H. |
作者单位 | 1.European Southern Observ ESO, Alonso de Cordova 3107, Santiago, Chile 2.Yale Univ, Dept Phys, Yale Ctr Astron & Astrophys, New Haven, CT 06520 USA 3.Chinese Acad Sci, Yunnan Observ, Kunming 650216, Yunnan, Peoples R China 4.Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 650216, Yunnan, Peoples R China 5.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 101408, Peoples R China 6.Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark 7.Tennessee State Univ, Ctr Excellence Informat Syst, Nashville, TN 37209 USA 8.Tech Univ Denmark, Natl Space Inst, DTU Space, Elektrovej 328, DK-2800 Lyngby, Denmark 9.Inst Astrofis Canarias, Tenerife 38205, Spain 10.Univ La Laguna, Dept Astrofis, Tenerife 38206, Spain |
推荐引用方式 GB/T 7714 | Korhonen, H.,Roettenbacher, R. M.,Gu SH,et al. Observing the changing surface structures of the active K giant sigma Geminorum with SONG[J]. ASTRONOMY & ASTROPHYSICS,2021,646:11. |
APA | Korhonen, H..,Roettenbacher, R. M..,Gu SH.,Grundahl, F..,Andersen, M. F..,...&Palle, P. L..(2021).Observing the changing surface structures of the active K giant sigma Geminorum with SONG.ASTRONOMY & ASTROPHYSICS,646,11. |
MLA | Korhonen, H.,et al."Observing the changing surface structures of the active K giant sigma Geminorum with SONG".ASTRONOMY & ASTROPHYSICS 646(2021):11. |
入库方式: OAI收割
来源:云南天文台
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