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

Seach, J. M. and Marsden, S. C. ORCID: https://orcid.org/0000-0001-5522-8887 and Carter, B. D. ORCID: https://orcid.org/0000-0003-0035-8769 and Neiner, C. and Folsom, C. P. (2022) The magnetic fields of β Coronae Borealis and the early F-star σ Bootis. Monthly Notices of the Royal Astronomical Society, 513 (3). pp. 4278-4294. ISSN 0035-8711

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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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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: File reproduced in accordance with the copyright policy of the publisher/author.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Date Deposited: 27 Jul 2022 04:46
Last Modified: 27 Jul 2022 04:46
Uncontrolled Keywords: stars: activity; stars: early-type; stars: magnetic field; stars:; solar-type
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
Identification Number or DOI: https://doi.org/10.1093/mnras/stac1173
URI: http://eprints.usq.edu.au/id/eprint/50221

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