Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...241..581d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 241, no. 2, Jan. 1991, p. 581-588.
Astronomy and Astrophysics
Astrophysics
13
Interstellar Chemistry, Interstellar Matter, Molecular Clouds, Radiation Distribution, Ultraviolet Radiation, Abundance, Equations Of State, Gas Dynamics, Interstellar Extinction, Interstellar Gas, Molecular Gases
Scientific paper
Local variations of the ultraviolet radiation field intensity in clumpy molecular cloud envelopes may trigger the formation or the destruction of dense regions with density contrasts greater than one order of magnitude. Equilibrium and nonequilibrium molecular gas equation of state is derived, focusing on the influence of the ultraviolet radiation field intensity, in order to study the gas response to local shielding. Collective motions are induced by condensation or expansion, which can feed turbulence. The short time scales involved in density variations, governed by cooling or heating processes, call for nonequilibrium molecular chemistry.
Chieze Jean Pierre
de Boisanger C.
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