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Observing the changing surface structures of the active K giant sigma Geminorum with SONG
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
Source PublicationASTRONOMY & ASTROPHYSICS
2021-02-01
Volume646Pages:11
DOI10.1051/0004-6361/202038799
Contribution Rank第3完成单位
Indexed BySCI
Keywordstars: activity stars: late-type stars: rotation starspots stars: individual: sigma Geminorum
Abstract

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.

Funding ProjectYale 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]
Funding OrganizationYale 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]
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星天文学 ; 恒星形成与演化
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherEDP SCIENCES S A
Publication Place17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE
ISSN0004-6361
URL查看原文
WOS IDWOS:000616488000001
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordFK COMAE BERENICES ; DIFFERENTIAL ROTATION ; FLIP-FLOP ; STARS ; LONGITUDES ; CYCLES ; SPOT ; SPECTROSCOPY ; ANDROMEDAE ; FLARE
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/24189
Collection系外行星研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorKorhonen, H.
Affiliation1.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
Recommended Citation
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.
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