NAOC Open IR
Stellar activity with LAMOST. III Tempora variability pattern in Pleiades, Praesepe, and Hyades
Fang, Xiang-Song1,2,3; Bidin, Christian Moni3; Zhao, Gang1,4; Zhang, Li-Yun5,6; Kumar, Yerra Bharat1
2020-07-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume495Issue:3Pages:2949-2965
AbstractWe present the results from a systerrratic study of temporal variation of stellar activity in young late-type stars. We used multi-epoch LAMOST (Large sky Area Multi-Object fiber Spectroscopic Telescope) low-resolution spectra of over 300 member candidates in three young open clusters: Pleiades, Praesepe. and Hyades. The spectral measurements of TO band strength near 7050 angstrom (TiO2) and equivalent width of H alpha line (EWH alpha) are used as the tracers of cool spot coverage and chromospheric emission strength, respectively. The analysis of time-variation patterns of these two tracers suggested that there exist detectable variabilities in TiO2 and LWH alpha, and their time-scales are in the wide range from days to years. Results showed that more active stars, younger and fast rotators, tend to have larger activity variations: There is a tendency of anticorrelation between temporal variations in TiO2 and EWH alpha. Also, appreciable anticorrelaticm in the rotational phase between H alpha emission and K2 brightness is detected in some M dwarfs, indicating spatial co-location of the plages with cool star-spots; however, cool stars do not always show such co-location features. Furthermore, spot coverage and H alpha emission were evident at all rotational phases of several M dwarfs, indicating a basal level of activity; perhaps due to many small and randomly located active regions in the atmosphere.
Keywordstars: activity stars: chromospheres stars: late-type starspots
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; CAS South America Center for Astronomy (CASSACA) in Santiago, Chile ; CAS South America Center for Astronomy (CASSACA) in Santiago, Chile ; National Development and Reform Commission ; National Development and Reform Commission ; NASA Science Mission directorate ; NASA Science Mission directorate ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; CAS South America Center for Astronomy (CASSACA) in Santiago, Chile ; CAS South America Center for Astronomy (CASSACA) in Santiago, Chile ; National Development and Reform Commission ; National Development and Reform Commission ; NASA Science Mission directorate ; NASA Science Mission directorate ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; CAS South America Center for Astronomy (CASSACA) in Santiago, Chile ; CAS South America Center for Astronomy (CASSACA) in Santiago, Chile ; National Development and Reform Commission ; National Development and Reform Commission ; NASA Science Mission directorate ; NASA Science Mission directorate ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; CAS South America Center for Astronomy (CASSACA) in Santiago, Chile ; CAS South America Center for Astronomy (CASSACA) in Santiago, Chile ; National Development and Reform Commission ; National Development and Reform Commission ; NASA Science Mission directorate ; NASA Science Mission directorate
DOI10.1093/mnras/staa1392
WOS KeywordSUN-LIKE STARS ; MAGNETIC ACTIVITY ; CHROMOSPHERIC ACTIVITY ; MAIN-SEQUENCE ; TIME-EVOLUTION ; COOL STARS ; SOLAR-TYPE ; EMISSION ; ROTATION ; DWARFS
Language英语
Funding ProjectNational Natural Science Foundation of China[11850410437] ; National Natural Science Foundation of China[11988101] ; National Natural Science Foundation of China[11890694] ; National Key R&D Program of China[2019YFA0405502] ; Chinese Academy of Sciences (CAS) ; CAS South America Center for Astronomy (CASSACA) in Santiago, Chile ; National Development and Reform Commission ; NASA Science Mission directorate
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; CAS South America Center for Astronomy (CASSACA) in Santiago, Chile ; CAS South America Center for Astronomy (CASSACA) in Santiago, Chile ; National Development and Reform Commission ; National Development and Reform Commission ; NASA Science Mission directorate ; NASA Science Mission directorate ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; CAS South America Center for Astronomy (CASSACA) in Santiago, Chile ; CAS South America Center for Astronomy (CASSACA) in Santiago, Chile ; National Development and Reform Commission ; National Development and Reform Commission ; NASA Science Mission directorate ; NASA Science Mission directorate ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; CAS South America Center for Astronomy (CASSACA) in Santiago, Chile ; CAS South America Center for Astronomy (CASSACA) in Santiago, Chile ; National Development and Reform Commission ; National Development and Reform Commission ; NASA Science Mission directorate ; NASA Science Mission directorate ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; CAS South America Center for Astronomy (CASSACA) in Santiago, Chile ; CAS South America Center for Astronomy (CASSACA) in Santiago, Chile ; National Development and Reform Commission ; National Development and Reform Commission ; NASA Science Mission directorate ; NASA Science Mission directorate
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000543025500033
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/82978
Collection中国科学院国家天文台
Corresponding AuthorFang, Xiang-Song; Zhao, Gang
Affiliation1.Chinese Acad Sci, Natl Astron Observ, CAS Key Lab Opt Astron, Beijing 100101, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Chinese Acad Sci South Amer Ctr Astron, Beijing 100101, Peoples R China
3.Univ Catolica Norte, Inst Astron, Av Angamos 0610, Antofagasta, Chile
4.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China
5.Guizhou Univ, Coll Phys, Guiyang 550025, Peoples R China
6.Guizhou Univ, Guizhou Prov Key Lab Publ Big Data, Guiyang 550025, Peoples R China
Recommended Citation
GB/T 7714
Fang, Xiang-Song,Bidin, Christian Moni,Zhao, Gang,et al. Stellar activity with LAMOST. III Tempora variability pattern in Pleiades, Praesepe, and Hyades[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2020,495(3):2949-2965.
APA Fang, Xiang-Song,Bidin, Christian Moni,Zhao, Gang,Zhang, Li-Yun,&Kumar, Yerra Bharat.(2020).Stellar activity with LAMOST. III Tempora variability pattern in Pleiades, Praesepe, and Hyades.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,495(3),2949-2965.
MLA Fang, Xiang-Song,et al."Stellar activity with LAMOST. III Tempora variability pattern in Pleiades, Praesepe, and Hyades".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 495.3(2020):2949-2965.
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