KMS National Astronomical Observatories, CAS
| 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 Publication | ASTROPHYSICAL JOURNAL
 |
| ISSN | 0004-637X |
| Volume | 906Issue:1Pages:11 |
| Abstract | We 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. |
| Keyword | Magnetic stars Flare stars Stellar activity F subgiant stars G subgiant stars K subgiant stars Main sequence Starspots |
| Funding Organization | 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 ; NASA Science Mission directorate |
| DOI | 10.3847/1538-4357/abc8ea |
| WOS Keyword | CHROMOSPHERIC ACTIVITY ; ABSOLUTE MAGNITUDES ; K-EMISSION ; COOL STARS ; X-RAY ; ROTATION ; CONVECTION ; EVOLUTION ; CORONAE ; GIANT |
| Language | 英语 |
| Funding Project | NASA Science Mission directorate |
| Funding Organization | 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 ; NASA Science Mission directorate |
| WOS Research Area | Astronomy & Astrophysics |
| WOS Subject | Astronomy & Astrophysics |
| WOS ID | WOS:000605082400001 |
| Publisher | IOP PUBLISHING LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.bao.ac.cn/handle/114a11/79883 |
| Collection | 中国科学院国家天文台 |
| Corresponding Author | Goodarzi, Hadis |
| Affiliation | 1.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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