The magnetic fields of β Coronae Borealis and the early F-star σ Bootis - Faculté des Sciences de Sorbonne Université Access content directly
Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2022

The magnetic fields of β Coronae Borealis and the early F-star σ Bootis

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.
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Dates and versions

insu-03713296 , version 1 (22-03-2023)

Licence

Attribution - CC BY 4.0

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J. M. Seach, S. C. Marsden, B. D. Carter, C. Neiner, C. P. Folsom. The magnetic fields of β Coronae Borealis and the early F-star σ Bootis. Monthly Notices of the Royal Astronomical Society, 2022, 513, pp.4278-4294. ⟨10.1093/mnras/stac1173⟩. ⟨insu-03713296⟩
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