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

Autor:	J M Seach, S C Marsden, B D Carter, C Neiner, C P Folsom
Rok vydání:	2022
Předmět:	Space and Planetary Science Astrophysics::Solar and Stellar Astrophysics Astronomy and Astrophysics Astrophysics::Earth and Planetary Astrophysics
Zdroj:	Monthly Notices of the Royal Astronomical Society. 513:4278-4294
ISSN:	1365-2966 0035-8711
DOI:	10.1093/mnras/stac1173
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f68d8265e67971151faae20e448bc7f2 https://doi.org/10.1093/mnras/stac1173 Zobrazit plný text záznamu