The magnetic fields and stellar winds of the mature late F-stars: β Virginis and θ Draconis

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 Evensberget, D. and Folsom, C. P. and Neiner, C. and Mengel, M. W. ORCID: https://orcid.org/0000-0002-7830-6822 (2022) The magnetic fields and stellar winds of the mature late F-stars: β Virginis and θ Draconis. Monthly Notices of the Royal Astronomical Society, 509 (4). pp. 5117-5141. ISSN 0035-8711

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Abstract

Mapping the large-scale magnetic field in late F-type stars is important for understanding the nature of the stellar dynamo and the dynamics of thin outer convection zones. We use Zeeman Doppler Imaging to produce multi-epoch maps of the surface magnetic field for two mature late F-type stars: β Virginis (F9V) and θ Draconis (F8IV). We also provide a magnetohydrodynamic model for the stellar winds from the corona to the inner astrosphere, which exists in an environment at the hot end of habitability for exoplanets. Our results show that either simple or complex dynamo magnetic fields are present in mature late F-type stars, with shallow outer convection zones. The results of stellar wind modelling show the average space weather for β Vir at a distance of 1 au falls within the range of space weather conditions observed at Earth, while θ Dra produces a wind pressure an order of magnitude stronger than the Sun's wind pressure.


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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 04:57
Last Modified: 27 Jul 2022 04:57
Uncontrolled Keywords: stars: magnetic field; stars: solar-type; stars: activity; stars:; winds; outflows
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/stab3289
URI: http://eprints.usq.edu.au/id/eprint/50220

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