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Paper: Modeling Low-mass Stars in the Presence of Magnetic Fields
Volume: 448, 16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun
Page: 1209
Authors: Mullan, D. J.; MacDonald, J.
Abstract: In the presence of a vertical magnetic field, the onset of convection in a star is inhibited relative to its onset in a non-magnetic star. Following early work of Gough and Tayler for a perfectly conducting medium, and including subsequent modifications due to finite magnetic resistivity, we have computed models of low-mass stars using a magnetically-altered criterion for the onset of convection. Our models have larger radii and cooler effective temperatures than non-magnetic models with the same mass and age. Our magnetic models provide a unified framework for interpreting a range of observational data, including radii which are observed to be “bloated” by as much as 10% relative to standard models, and reduced effective temperatures, for stars ranging in spectral types from solar to brown dwarfs.
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