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Magnetohydrostatic modelling of stellar coronae

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MNRAS_2016_MacTaggart_767_74.pdf (981.5Kb)
Date
11/02/2016
Author
MacTaggart, David
Gregory, Scott
Neukirch, Thomas
Donati, Jean-Francois
Funder
Science & Technology Facilities Council
Science & Technology Facilities Council
Grant ID
ST/K000950/1
ST/J003255/1
Keywords
MHD
Methods: analytical
Stars: coronae
Magnetic field
QB Astronomy
QA Mathematics
QC Physics
T-NDAS
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Abstract
We introduce to the stellar physics community a method of modelling stellar coronae that can be considered to be an extension of the potential field. In this approach, the magnetic field is coupled to the background atmosphere. The model is magnetohydrostatic and is a balance between the Lorentz force, the pressure gradient and gravity. Analytical solutions are possible and we consider a particular class of equilibria in this paper. The model contains two free parameters and the effects of these on both the geometry and topology of the coronal magnetic field are investigated. A demonstration of the approach is given using a magnetogram derived from Zeeman–Doppler imaging of the 0.75 M⊙ M-dwarf star GJ 182.
Citation
MacTaggart , D , Gregory , S , Neukirch , T & Donati , J-F 2016 , ' Magnetohydrostatic modelling of stellar coronae ' , Monthly Notices of the Royal Astronomical Society , vol. 456 , no. 1 , pp. 767-774 . https://doi.org/10.1093/mnras/stv2714
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
DOI
https://doi.org/10.1093/mnras/stv2714
ISSN
0035-8711
Type
Journal article
Rights
© 2016, Publisher / the Author(s). This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at mnras.oxfordjournals.org / https://dx.doi.org/10.1093/mnras/stv2714
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/8067

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