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Title:
The photoevaporation of interstellar clouds. I - Radiation-driven implosion
Authors:
Bertoldi, Frank
Affiliation:
AA(California, University, Berkeley)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 346, Nov. 15, 1989, p. 735-755. Research sponsored by NASA. (ApJ Homepage)
Publication Date:
11/1989
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
H Ii Regions, Interstellar Matter, Molecular Clouds, Computational Astrophysics, Evaporation, Ionized Gases, Lyman Alpha Radiation, Radiation Distribution, Shock Fronts, Star Formation
DOI:
10.1086/168055
Bibliographic Code:
1989ApJ...346..735B

Abstract

An approximate analytical solution is developed for the evolution of an interstellar neutral cloud exposed to the ionizing radiation of a newly formed star. The structure of a steady photoevaporation gas flow off a spherical ionization front is derived even for cases where the ionization front cannot be considered thin, and the downstream flow is not in ionization and thermal equilibrium. Under a wide range of conditions, the ionization front is approximately D-critical, and the ionized gas expands supersonically into the intercloud medium. The ionization front typically drives a strong shock into the initial cloud.

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