The gasdynamics of H II regions. V - The interaction of weak R ionization fronts with dense clouds

Details The gasdynamics of H II regions. V - The interaction of weak R ionization fronts with dense clouds The gasdynamics of H II regions. V - The interaction of weak R ionization fronts with dense clouds

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....99..305t&link_type=abstract

Astronomy and Astrophysics, vol. 99, no. 2, June 1981, p. 305-310.

Astronomy and Astrophysics

Astrophysics

14

Gas Density, Gas Dynamics, H Ii Regions, Interstellar Gas, Ionized Gases, Hydrogen Ions, Time Dependence

Scientific paper

The interaction of weak R-type ionization fronts with a density enhancement is calculated numerically as a function of time within the framework of the champagne model of the evolution of H II regions. Calculations are performed under the assumption of plane-parallel geometry for various relative densities of the cloud in which the exciting star is formed and a second cloud with which an ionization front from the first cloud interacts. The supersonic ionization front representing the outer boundary of an H II region experiencing the champagne phase is found to either evolve into a D-type front or remain of type R, depending on the absolute number of photons leaving the H II region that undergoes the champagne phase. Recombinations in the ionized gas eventually slow the ionization front, however photon fluxes allow it to speed up again, resulting in oscillatory propagation of the front. Front-cloud interactions are also shown to lead to the development of a backward-facing shock, a forward-facing shock, and a density maximum in the ionized gas. The results can be used to explain the origin of bright rims in H II regions.

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