Diffusion and sedimentation of dust in molecular clouds

Details Diffusion and sedimentation of dust in molecular clouds Diffusion and sedimentation of dust in molecular clouds

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...226l..95h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 226, Dec. 1, 1978, p. L95-L98.

Astronomy and Astrophysics

Astrophysics

8

Cosmic Dust, Interstellar Matter, Molecular Diffusion, Planetary Nebulae, Stellar Mass Accretion, Clouds, Globules, Stellar Evolution

Scientific paper

A general theorem is derived for the diffusion of grains and the formation of dust concentrations in molecular clouds. The clouds are of arbitrary configuration and are supported by thermal pressure gradients, turbulence motions, and magnetic fields. The time scale for drainage of dust into pools of enhanced concentration is typically of the order of 100 million years and is less than the estimated ages of giant molecular clouds according to recent evidence. Relevant time scales and length scales, and the effect of magnetic fields, are discussed. Brief comments are made on some possible consequences of dust sedimentation, such as the formation of Bok globules and low-mass stars, and the sequestration of heavy elements in cometary condensations

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