Publication Abstracts

Stothers 2008

Stothers, R.B., 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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