Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...202..177i&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 202, no. 1-2, Aug. 1988, p. 177-188.
Astronomy and Astrophysics
Astrophysics
94
Cavitation Flow, Hydrodynamic Equations, Interstellar Gas, Planetary Nebulae, Stellar Winds, Partial Differential Equations, Shock Wave Propagation, Supersonic Flow
Scientific paper
When an explosion ocurs in an inhomogeneous medium, the resulting shock propagates anisotropically. Likewise, a supersonic stellar wind, blowing into such a medium, generates an aspherical cavity. The author derives an approximation for the propagation of nonspherical wind-driven bubbles, based on Kompaneets's treatment of a point explosion in an inhomogeneous atmosphere. The partial differential equation that describes such bubbles is separable in the case that the atmosphere, into which the bubble is blown, has been deposited by a previous slow stellar wind. This condition occurs in planetary nebulae, which thus provide an interesting illustration of the mechanism discussed here. In some cases, the same formalism can be applied to bubbles blown by intrinsically nonspherical winds (e.g. due to jets). As an example, this approximation is applied to SS433/W50.
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