Publication Abstracts
Stothers 2008
, 2008: Analytic criteria for the mechanical and thermal stability of magnetic stars with finite electrical conductivity. Astrophys. J., 686, 1275-1279, doi:10.1086/591546.
The usual assumption of infinite electrical conductivity has been relaxed in a new analytic treatment of the magnetohydrodynamics of a variable magnetic star in the simple one-zone approximation. For a not too low electrical conductivity, the magnetic pressure changes with the mass density as roughly ρ1/3, and the Joule heating rate goes as roughly ρ. The magnetic effective adiabatic exponent of about 4/3 proves to have only a small influence on the criteria for dynamical, secular, and pulsational stability, but the Joule heating rate directly affects the secular and pulsational stability criteria. Thus, a finite electrical conductivity tends to stabilize a magnetic star secularly and to destabilize it pulsationally. These specific results apply, however, only to purely radial perturbations of the star's upper radiative layers.
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BibTeX Citation
@article{st09810t,
author={Stothers, R. B.},
title={Analytic criteria for the mechanical and thermal stability of magnetic stars with finite electrical conductivity},
year={2008},
journal={Astrophys. J.},
volume={686},
pages={1275--1279},
doi={10.1086/591546},
}
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RIS Citation
TY - JOUR ID - st09810t AU - Stothers, R. B. PY - 2008 TI - Analytic criteria for the mechanical and thermal stability of magnetic stars with finite electrical conductivity JA - Astrophys. J. VL - 686 SP - 1275 EP - 1279 DO - 10.1086/591546 ER -
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