Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974a%26a....37..375y&link_type=abstract
Astronomy and Astrophysics, vol. 37, no. 2, Dec. 1974, p. 375-382.
Astronomy and Astrophysics
Astrophysics
3
Abundance, Astronomical Models, Cosmic Dust, Interstellar Matter, Nebulae, Carbon, Depletion, Heavy Elements, Interstellar Gas, Phase Transformations, Time Dependence
Scientific paper
A time-dependent depletion model with two free parameters is presented, wherein the accretion of heavier elements (carbon and higher) on the surfaces of dust grains and the evaporation of these elements back into the interstellar gas are taken into account. The equilibrium properties of the model and the evolution of two large colliding clouds are discussed as functions of the sticking factor and the evaporation parameter. It is shown that even for a small evaporation parameter, very little cloud material undergoes the heavy element depletion needed for a phase transition to the hot intercloud phase, assuming a constant heating rate. It is suggested that a combination of the varying heating rate and large-scale pressure decrease following the passage of a spiral arm density wave or a shock wave would be a more effective mechanism of phase-transition cloud destruction than depletion of heavy elements.
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