Magnetically Distorted Polytropes. II: Non-Radial Oscillations

Details Magnetically Distorted Polytropes. II: Non-Radial Oscillations Magnetically Distorted Polytropes. II: Non-Radial Oscillations

Dec 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973ap%26ss..25..457b&link_type=abstract

Astrophysics and Space Science, Volume 25, Issue 2, pp.457-469

Astronomy and Astrophysics

Astrophysics

2

Scientific paper

The fundamental frequencies of the non-radial mode of oscillation belonging to the second harmonic (l=2) of magnetically distorted polytropic gas spheres are evaluated in the ‘second approximation’ by a variational method. The magnetic field is assumed to have both the toroidal and the poloidal components. We find that the frequencies of oscillation are increased due to the presence of the magnetic field and that these depend only slightly on the value of γ, the ratio of the specific heats. We have also determined the value of γ<1+1/n for the mode of oscillation which exhibits convective instability. This value is lower than the one which is obtained in the absence of a magnetic field.

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