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Linking radio flares with spots on the active binary UX Arietis

Published online by Cambridge University Press:  24 September 2020

Christian A. Hummel Open the ORCID record for Christian A. Hummel [Opens in a new window]  and
Anthony Beasley
Christian A. Hummel
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany email: chummel@eso.org
Anthony Beasley
Affiliation:
National Radio Astronomy Observatory, Charlottesville, VA 22903, USA email: tbeasley@nrao.edu
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Abstract

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Signs of stellar activity such as large surface spots and radio flares are often related to binarity. UX Arietis is one of the most active members of the RS CVn class of binaries in which spin-up of a sub-giant/giant star by a close companion leads to the creation of magnetic fields. UX Arietis exhibits these signs of activity, originating mostly on the K0 sub-giant primary component. We measured the orbit with the CHARA interferometer and made images of a single large spot rotating in and out of view over a month in 2012. The rotation of the stars is synchronous with the orbit, and long-term photometric observations show that the spot or spots do not move much during intervals of a year. Our aim is to relate the positions of the stars and the spots on the primary to astrometry of the radio components observed during outbursts.

Keywords

techniques: interferometricstars: activitystars: flarestars: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S354: Solar and Stellar Magnetic Fields: Origins and Manifestations , June 2019 , pp. 418 - 420
Copyright
© International Astronomical Union 2020

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