Other
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...686.1275s&link_type=abstract
The Astrophysical Journal, Volume 686, Issue 2, pp. 1275-1279.
Other
Instabilities, Magnetohydrodynamics: Mhd, Stars: Magnetic Fields, Stars: Oscillations, Stars: Variables: Other
Scientific paper
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 ρ4/3, 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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