The Suppression and Promotion of Magnetic Flux Emergence in Fully Convective Stars

Evidence of surface magnetism is now observed on an increasing number of cool stars. The detailed manner by which dynamo-generated magnetic fields giving rise to starspots traverse the convection zone still remains unclear. Some insight into this flux emergence mechanism has been gained by assuming...

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Bibliographic Details
Published in:Proceedings of the International Astronomical Union 2016-10, Vol.12 (S328), p.85-92
Main Authors: Weber, Maria A., Browning, Matthew K., Boardman, Suzannah, Clarke, Joshua, Pugsley, Samuel, Townsend, Edward
Format: Article
Language:English
Subjects:
Astronomy
Browning
Contributed Papers
Convection
Convective flow
Cool stars
Differential rotation
Emergence
Flow pattern
Fluctuations
Magnetic fields
Magnetic flux
Magnetism
Promotion
Stars
Starspots
Tubes
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Summary:Evidence of surface magnetism is now observed on an increasing number of cool stars. The detailed manner by which dynamo-generated magnetic fields giving rise to starspots traverse the convection zone still remains unclear. Some insight into this flux emergence mechanism has been gained by assuming bundles of magnetic field can be represented by idealized thin flux tubes (TFTs). Weber & Browning (2016) have recently investigated how individual flux tubes might evolve in a 0.3M⊙ M dwarf by effectively embedding TFTs in time-dependent flows representative of a fully convective star. We expand upon this work by initiating flux tubes at various depths in the upper ~50-75% of the star in order to sample the differing convective flow pattern and differential rotation across this region. Specifically, we comment on the role of differential rotation and time-varying flows in both the suppression and promotion of the magnetic flux emergence process.
ISSN:1743-9213
1743-9221
DOI:10.1017/S1743921317003830