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Stellar activity with LAMOST - II. Chromospheric activity in open clusters
Fang, Xiang-Song1; Zhao, Gang1,2; Zhao, Jing-Kun1; Kumar, Yerra Bharat1
2018-05-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume476Issue:1Pages:908-926
AbstractWe use the LAMOST spectra of member stars in Pleiades, M34, Praesepe, and Hyades to study how chromospheric activity varies as a function of mass and rotation at different age. We measured excess equivalent widths of H alpha, H beta, and Ca II K based on estimated chromospheric contributions from old and inactive field dwarfs, and excess luminosities are obtained by normalizing bolometric luminosity, for more than 700 late-type stars in these open clusters. Results indicate two activity sequences in cool spot coverage and Ha excess emission among GK dwarfs in Pleiades andMdwarfs in Praesepe and Hyades, paralleling with well-known rotation sequences. A weak dependence of chromospheric emission on rotation exists among ultrafast rotators in saturated regime with Rossby number Ro less than or similar to 0.1. In the unsaturated regime, chromospheric and coronal emission show similar dependence on Ro, but with a shift towards larger Ro, indicating chromospheric emission gets easily saturated than coronal emission, and/or convective turnover time-scales based on X-ray data do not work well with chromospheric emission. More interestingly, our analysis shows fully convective slow rotators obey the rotation-chromospheric activity relation similar to hotter stars, confirming the previous finding. We found correlations among H alpha, H beta, and Ca II K emissions, in which H alpha losses are more important than Ca II K for cooler and more active stars. In addition, a weak correlation is seen between chromospheric emission and photospheric activity that shows dependence on stellar spectral type and activity level, which provides some clues on how spot configuration varies as a function of mass and activity level.
Keywordstars: activity stars: chromospheres stars: late-type stars: rotation
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Basic Research Program of China (973 program) ; National Key Basic Research Program of China (973 program) ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; Alibaba Cloud ; Alibaba Cloud ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Basic Research Program of China (973 program) ; National Key Basic Research Program of China (973 program) ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; Alibaba Cloud ; Alibaba Cloud ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Basic Research Program of China (973 program) ; National Key Basic Research Program of China (973 program) ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; Alibaba Cloud ; Alibaba Cloud ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Basic Research Program of China (973 program) ; National Key Basic Research Program of China (973 program) ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; Alibaba Cloud ; Alibaba Cloud ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Development and Reform Commission ; National Development and Reform Commission
DOI10.1093/mnras/sty212
WOS KeywordLOW-MASS STARS ; SOLAR-TYPE STARS ; MAIN-SEQUENCE STARS ; SUN-LIKE STARS ; DIGITAL SKY SURVEY ; X-RAY-EMISSION ; NGC 1039 M34 ; M-DWARFS ; COOL STARS ; ROTATIONAL VELOCITIES
Language英语
Funding ProjectNational Natural Science Foundation of China[11390371] ; National Natural Science Foundation of China[11233004] ; National Natural Science Foundation of China[11573035] ; National Natural Science Foundation of China[11625313] ; National Natural Science Foundation of China[11550110492] ; National Key Basic Research Program of China (973 program)[2014CB845701] ; Astronomical Big Data Joint Research Center ; Alibaba Cloud ; Chinese Academy of Sciences ; National Development and Reform Commission
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Basic Research Program of China (973 program) ; National Key Basic Research Program of China (973 program) ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; Alibaba Cloud ; Alibaba Cloud ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Basic Research Program of China (973 program) ; National Key Basic Research Program of China (973 program) ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; Alibaba Cloud ; Alibaba Cloud ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Basic Research Program of China (973 program) ; National Key Basic Research Program of China (973 program) ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; Alibaba Cloud ; Alibaba Cloud ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Basic Research Program of China (973 program) ; National Key Basic Research Program of China (973 program) ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; Alibaba Cloud ; Alibaba Cloud ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Development and Reform Commission ; National Development and Reform Commission
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000429276700071
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/37119
Collection中国科学院国家天文台
Corresponding AuthorFang, Xiang-Song
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
2.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Fang, Xiang-Song,Zhao, Gang,Zhao, Jing-Kun,et al. Stellar activity with LAMOST - II. Chromospheric activity in open clusters[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,476(1):908-926.
APA Fang, Xiang-Song,Zhao, Gang,Zhao, Jing-Kun,&Kumar, Yerra Bharat.(2018).Stellar activity with LAMOST - II. Chromospheric activity in open clusters.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,476(1),908-926.
MLA Fang, Xiang-Song,et al."Stellar activity with LAMOST - II. Chromospheric activity in open clusters".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 476.1(2018):908-926.
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