The magnetic fields of β Coronae Borealis and the early F-star σ Bootis
Article
Article Title | The magnetic fields of β Coronae Borealis and the early F-star σ Bootis |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Seach, J. M. (Author), Marsden, S. C. (Author), Carter, B. D. (Author), Neiner, C. (Author) and Folsom, C. P. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 513 (3), pp. 4278-4294 |
Number of Pages | 17 |
Year | 2022 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stac1173 |
Web Address (URL) | https://academic.oup.com/mnras/article/513/3/4278/6575936 |
Abstract | The study of magnetism in stars close to the transition from fossil to dynamo magnetic fields is important for understanding the nature of the stellar dynamo and dynamics of the outer atmosphere. We present surface magnetic maps for two stars that are located on opposite sides of the suspected transition zone: the chemically peculiar late A-star β Coronae Borealis (A9SrEuCr) and the early F-star σ Bootis (F3V). The large-scale magnetic field reconstructed at six epochs for β Coronae Borealis shows a complex fossil magnetic field, which is highly poloidal, and contains almost half the magnetic energy in higher multipoles (l > 1). In contrast, the single epoch magnetic map for σ Bootis contains a simple surface magnetic topology that is mostly poloidal, and predominantly dipolar, and is consistent with observations of other mature late F-stars. |
Keywords | stars: activity; stars: early-type; stars: magnetic field; stars: solar-type |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2022 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | Centre for Astrophysics |
University of Paris, France | |
University of Tartu, Estonia | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q78z2/the-magnetic-fields-of-coronae-borealis-and-the-early-f-star-bootis
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