Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...273..267g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 273, Oct. 1, 1983, p. 267-279.
Astronomy and Astrophysics
Astrophysics
10
Hydrodynamic Equations, Magnetohydrodynamic Stability, Plasma Dynamics, Stellar Evolution, Stellar Mass Ejection, Supernova Remnants, Bernoulli Theorem, Nebulae, Radiative Heat Transfer, Stellar Envelopes, Stellar Temperature, Thermal Stability
Scientific paper
Attention is given to the idealizations and approximations of a semianalytical solution for the hydrodynamical evolution of an SNR during the snowplow phase. Because, according to the standard model, cooling occurs only near the outer surface of the SNR, it is assumed that adiabaticity holds throughout most of the hot volume interior. This flow is treated by means of an analytical method based on a series expansion of the general equations. Since the first-order solution does not yield good results, a second-order expansion of the solution was employed and found to exhibit oscillations of growing amplitude. These are interpreted as the development of the thermal instability that results from a negative slope of the cooling rate versus temperature, and that is responsible for the partial failure of the first-order solution.
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