The propagation of an ionization front in an inhomogeneous medium

Details The propagation of an ionization front in an inhomogeneous medium The propagation of an ionization front in an inhomogeneous medium

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...234..615i&link_type=abstract

Astrophysical Journal, Part 1, vol. 234, Dec. 1, 1979, p. 615-618.

Astronomy and Astrophysics

Astrophysics

9

Density Distribution, Gas Ionization, Interstellar Matter, Shock Fronts, Shock Wave Propagation, Equations Of Motion, Gas Density, Inhomogeneity, Luminous Intensity, Stellar Envelopes

Scientific paper

An approximation is given for the propagation of an ionization front around a star which suddenly switches on in a neutral, inhomogeneous medium. It is shown that when the density distribution has a scale height H and a typical density n0, the front opens up in a time of about 8pi(n0)H-cubed/L, if the Lyman continuum luminosity L of the star is high enough. After the initial rapid phase, the front very slowly settles into the shape of the equilibrium Stroemgren region. A specific example of this behavior is given in the case of an exponential plane-parallel atmosphere.

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