Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...202l..87s&link_type=abstract
Astrophysical Journal, vol. 202, Dec. 1, 1975, pt. 2, p. L87-L90.
Astronomy and Astrophysics
Astronomy
125
Abundance, Cosmic Dust, Interstellar Matter, Astronomical Models, Granular Materials, Interstellar Gas, Ionization Potentials, Nebulae, Particle Size Distribution, Spaceborne Astronomy
Scientific paper
Observational data obtained by the Copernicus satellite and ground-based facilities are discussed which show that the depletion of interstellar elements apparently varies with cloud density in the way to be expected if the depletions were due to accretion of gas atoms or ions onto grains. It is shown that the depletion-by-accretion mechanism is supported by a good correlation between depletions and first ionization potentials of the elements (except for lithium, sodium, and potassium) and that this mechanism offers an alternative to the grain-condensation hypothesis in which most of the interstellar medium is required to have been processed through stellar nebulae. It is noted that if the grains do not normally carry positive charges, ion-grain encounters are the most important interactions between gas and dust and may be significant in determining ionization equilibrium, especially if there is a large population of very small grains.
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