A Magnetic Snapshot Survey of F-Type Stars
| Autor: | Coralie Neiner, J. M. Seach, B. Buysschaert, M. E. Oksala, Brad D. Carter, Colin P. Folsom, Matthew W. Mengel, Stephen C. Marsden |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
010308 nuclear & particles physics Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Stellar classification 01 natural sciences Spectral line Magnetic field Stars Convection zone Space and Planetary Science 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics 010303 astronomy & astrophysics Dynamo |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/staa1107 |
| Popis: | We present a spectropolarimetric magnetic snapshot survey of 55 stars which includes 53 F-type stars ranging from spectral types F0 to F9 plus 2 chemically peculiar stars β CrB, and δ Cap. We look for magnetic fields in stars spanning a range of effective temperatures where the transition from fossil to dynamo magnetic fields is believed to occur. High-resolution spectropolarimetry using circularly polarized spectra is used to look for a magnetic detection in the Stokes V profile, determine the mean longitudinal magnetic field (Bl), and to look for correlations with stellar parameters. Surface magnetic fields are detected on 14 F-stars, and present in every spectral class from F3V-F9V ranging in strength from 0.3 ± 0.1 G (36 UMa, F8V) to 8.3 ± 0.9 G (h Dra, F8V). Thus we find photospheric magnetic fields are present in stars as early as spectral type F3V with an outer convection zone thickness less than a few per cent of the stellar radius. |
| Databáze: | OpenAIRE |
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