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Magnetic confinement in the wind of low mass stars

Published online by Cambridge University Press:  16 August 2023

Rose F. P. Waugh
Affiliation:
School of Physics and Astronomy, University of St Andrews, Scotland
Moira M. Jardine
Affiliation:
School of Physics and Astronomy, University of St Andrews, Scotland
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Abstract

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Magnetic confinement of material is observed on both high and low mass stars. On low mass stars, this confinement can be seen as slingshot prominences, in which condensations are supported several stellar radii above the surface by strong magnetic fields. We present a model for generating cooled field lines in equilibrium with the background corona, which we use to populate a model corona. We find prominence masses on the order of observationally derived values. We find two types of solutions: footpoint heavy “solar-like prominences” and summit heavy “slingshot prominences” which are centrifugally supported. These can form within the open field region i.e. embedded in the wind. We generate Hα spectra from different field structures and show that all display behaviour that is consistent with observations. This implies that the features seen in observations could be supported by a range of conditions, suggesting they would be common across rapidly rotating stars.

Type
Contributed Paper
Creative Commons
Creative Common License - CCCreative Common License - BYCreative Common License - NCCreative Common License - SA
This is an Open Access article, distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike licence (https://creativecommons.org/licenses/by-nc-sa/4.0/), which permits noncommercial re-use, distribution, and reproduction in any medium, provided the same Creative Commons licence is included and the original work is properly cited. The written permission of Cambridge University Press must be obtained for commercial re-use.
Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

References

Collier Cameron, Andrew, 1999, ASP Conference Series, 158, 146 Google Scholar
Waugh, Rose F. P. and Jardine, Moira M., 2022, MNRAS, 514, 5465CrossRefGoogle Scholar