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Flare Activity and Magnetic Feature Analysis of the Flare Stars. II. Subgiant Branch
Goodarzi, Hadis1; Mehrabi, Ahmad1,2; Khosroshahi, Habib G.1; He, Han3
2021
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume906Issue:1Pages:11
AbstractWe present an investigation of the magnetic activity and flare characteristics of the subgiant stars mostly from F and G spectral types and compare the results with the main-sequence (MS) stars. The light curve of 352 stars on the subgiant branch (SGB) from the Kepler mission is analyzed in order to infer stability, relative coverage, and contrast of the magnetic structures and also flare properties using three flare indexes. The results show the following. (i) Relative coverage and contrast of the magnetic features along with rate, power, and magnitude of flares increase on the SGB due to the deepening of the convective zone and more vigorous magnetic field production. (ii) Magnetic activity of the F- and G-type stars on the SGB does not show dependency on the rotation rate and does not obey the saturation regime. This is the opposite of what we saw for the MS, in which the G-, K-, and M-type stars show clear dependency on the Rossby number. (iii) The positive relationship between the magnetic features' stability and their relative coverage and contrast remains true on the SGB; though, it has a lower dependency coefficient in comparison with the MS. (iv) Magnetic proxies and flare indexes of the SGB stars increase with increasing relative mass of the convective zone.
KeywordMagnetic stars Flare stars Stellar activity F subgiant stars G subgiant stars K subgiant stars Main sequence Starspots
Funding OrganizationNASA Science Mission directorate ; NASA Science Mission directorate ; NASA Science Mission directorate ; NASA Science Mission directorate ; NASA Science Mission directorate ; NASA Science Mission directorate ; NASA Science Mission directorate ; NASA Science Mission directorate
DOI10.3847/1538-4357/abc8ea
WOS KeywordCHROMOSPHERIC ACTIVITY ; ABSOLUTE MAGNITUDES ; K-EMISSION ; COOL STARS ; X-RAY ; ROTATION ; CONVECTION ; EVOLUTION ; CORONAE ; GIANT
Language英语
Funding ProjectNASA Science Mission directorate
Funding OrganizationNASA Science Mission directorate ; NASA Science Mission directorate ; NASA Science Mission directorate ; NASA Science Mission directorate ; NASA Science Mission directorate ; NASA Science Mission directorate ; NASA Science Mission directorate ; NASA Science Mission directorate
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000605082400001
PublisherIOP PUBLISHING LTD
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/79881
Collection中国科学院国家天文台
Corresponding AuthorGoodarzi, Hadis
Affiliation1.Inst Res Fundamental Sci IPM, Sch Astron, POB 19395-5746, Tehran, Iran
2.Bu Ali Sina Univ 65178, Dept Phys, Hamadan 016016, Hamadan, Iran
3.Chinese Acad Sci, Natl Astron Observ, CAS Key Lab Solar Act, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Goodarzi, Hadis,Mehrabi, Ahmad,Khosroshahi, Habib G.,et al. Flare Activity and Magnetic Feature Analysis of the Flare Stars. II. Subgiant Branch[J]. ASTROPHYSICAL JOURNAL,2021,906(1):11.
APA Goodarzi, Hadis,Mehrabi, Ahmad,Khosroshahi, Habib G.,&He, Han.(2021).Flare Activity and Magnetic Feature Analysis of the Flare Stars. II. Subgiant Branch.ASTROPHYSICAL JOURNAL,906(1),11.
MLA Goodarzi, Hadis,et al."Flare Activity and Magnetic Feature Analysis of the Flare Stars. II. Subgiant Branch".ASTROPHYSICAL JOURNAL 906.1(2021):11.
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