Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..84..205g&link_type=abstract
Astrophysics and Space Science, vol. 84, no. 1, May 1982, p. 205-223. Research supported by the Science Research Council.
Astronomy and Astrophysics
Astrophysics
3
Explosions, Interstellar Magnetic Fields, Interstellar Space, Magnetic Effects, Stellar Mass Ejection, Adiabatic Conditions, Magnetohydrodynamics, Perturbation, Shock Waves, Stellar Flares, Stellar Winds, Supernovae
Scientific paper
The problem of an adiabatic explosion into a uniform magnetic field which is frozen to the gas is considered numerically, as a paradigm for various explosive processes in the interstellar medium. It is found that the outer shock becomes oblate with respect to the field lines, while the inner hot gas has prolate density and temperature contours. During the later stages, when the shock weakens and the explosion comes into equilibrium with the interstellar medium, the dominant feature is a concentration of accelerated material at each pole whose analytical interpretation, considering the magnetic field as a small perturbation to a spherical explosion, permits the derivation of an eccentricity formula which is proportional to t to the 6/5 power. An approximation is given for the self-similar flow at the center, to which the singular linear perturbation must be matched. The asymptotic regimes involved are discussed.
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