The gas dynamics of H II regions. II - Two-dimensional axisymmetric calculations

Details The gas dynamics of H II regions. II - Two-dimensional axisymmetric calculations The gas dynamics of H II regions. II - Two-dimensional axisymmetric calculations

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...233...85b&link_type=abstract

Astrophysical Journal, Part 1, vol. 233, Oct. 1, 1979, p. 85-96.

Astronomy and Astrophysics

Astrophysics

193

Astronomical Models, Gas Dynamics, H Ii Regions, Interstellar Matter, Nebulae, Stellar Evolution, Gas Ionization, Graphs (Charts), Hydrodynamic Equations, Hydrodynamics, Mathematical Models, Tables (Data)

Scientific paper

Hydrodynamic numerical calculations of the evolution of H II regions in dense molecular clouds are extended to two space dimensions with axial symmetry. Specific problems are treated which emphasize the behavior of flows that cross a discontinuity between a cloud and the low-density intercloud medium. Calculations are performed for four cases, including two involving 'champagne flows': (1) the edge of the cloud is overrun by a supersonic ionization front; (2) the initial Stromgren sphere surrounding the star lies deep inside the cloud, so that the cloud's edge is ionized by a subsonic ionization front; (3) the ionization front breaks through two opposite faces of the same cloud simultaneously; and (4) the flow encounters an isolated globule with a density of 1000 particles/cu cm shortly after emerging from the molecular cloud. The results are compared with observations of various interstellar clouds.

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