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Magnetic support of stellar slingshot prominences

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Waugh_2018_MNRAS_Magneticsupport_FinalPubVersion.pdf (3.238Mb)
Date
21/02/2019
Author
Waugh, Rose F. P.
Jardine, Moira M.
Keywords
Stars: individual: AB Dor
Stars: low mass
Stars: magnetic field
QB Astronomy
T-NDAS
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Abstract
We present models for the magnetic support of the ‘slingshot prominences’ observed in the coronae of rapidly rotating stars. We calculate mechanical equilibria of loops in a spherical geometry. Prominence-forming loops are found first for dipolar and quadrupolar stellar fields that are fully closed. Equilibria are then found within the stellar wind for a dipolar field that becomes open beyond a given radius. We identify two physical processes that may produce gaps in the distribution of prominence heights: the location of this opening radius, and the behaviour of the buoyancy force. The buoyancy may differ from one prominence-bearing loop to another if they are at different temperatures, thus potentially smearing out any gap in observed height distributions. We produce synthetic prominence distributions and compare to the observations of two well-observed stars: AB Doradus and Speedy Mic. The model recovers the more compact prominence distribution observed for Speedy Mic and reproduces better the overall shape of the height distributions for both stars when the opening radius is beyond the co-rotation radius.
Citation
Waugh , R F P & Jardine , M M 2019 , ' Magnetic support of stellar slingshot prominences ' , Monthly Notices of the Royal Astronomical Society , vol. 483 , no. 2 , pp. 1513-1522 . https://doi.org/10.1093/mnras/sty3225
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
DOI
https://doi.org/10.1093/mnras/sty3225
ISSN
0035-8711
Type
Journal article
Rights
© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at: https://doi.org/10.1093/mnras/sty3225
Description
The authors acknowledge support from STFC.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/16677

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