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Roche tomography of cataclysmic variables – VII. The long-term magnetic activity of AE Aqr

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Hill, C. A., Watson, C. A., Steeghs, D., Dhillon, V. S. and Shahbaz, T. (2016) Roche tomography of cataclysmic variables – VII. The long-term magnetic activity of AE Aqr. Monthly Notices of the Royal Astronomical Society, 459 (2). pp. 1858-1874. doi:10.1093/mnras/stw766

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Official URL: http://dx.doi.org/10.1093/mnras/stw766

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Abstract

We present a long-term study of the secondary star in the cataclysmic variable AE Aqr, using Roche tomography to indirectly image starspots on the stellar surface spanning 8 years of observations. The seven maps show an abundance of spot features at both high and low latitudes. We find that all maps have at least one large high-latitude spot region, and we discuss its complex evolution between maps, as well as its compatibility with current dynamo theories. Furthermore, we see the apparent growth in fractional spot coverage, fs, around 45° latitude over the duration of observations, with a persistently high fs near latitudes of 20°. These bands of spots may form as part of a magnetic activity cycle, with magnetic flux tubes emerging at different latitudes, similar to the ‘butterfly’ diagram for the Sun. We discuss the nature of flux tube emergence in close binaries, as well as the activity of AE Aqr in the context of other stars.

Item Type: Journal Article
Divisions: Faculty of Science > Physics
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Oxford University Press
ISSN: 0035-8711
Official Date: 5 April 2016
Dates:
DateEvent
5 April 2016Available
31 March 2016Accepted
30 March 2016Submitted
Volume: 459
Number: 2
Page Range: pp. 1858-1874
DOI: 10.1093/mnras/stw766
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access

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