Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ap%26ss..66..161t&link_type=abstract
Astrophysics and Space Science, vol. 66, no. 1, Nov. 1979, p. 161-171.
Astronomy and Astrophysics
Astrophysics
1
Anomalies, Depletion, Gas Ionization, Interstellar Gas, Ionization Potentials, Vapor Phases, Abundance, Alkali Metals, Condensing, Metal Vapors, Oao 3, Satellite Observation, Thermodynamic Equilibrium
Scientific paper
The paper considers interstellar depletion anomalies and ionization potentials. Satellite observations indicate that (1) most elements are depleted from the gas phase when compared to cosmic abundances, (2) some elements are several orders of magnitude more depleted than others, and (3) these depletions vary from cloud to cloud. Depletions occur either by accretion onto core particles in interstellar clouds or earlier, during the period of primary grain formation. If the latter mechanism is dominant, then the most important depletion parameter is the condensation temperature of the elements and their compounds. It is shown that electrostatic effects can enhance the capture cross-section of the grain and suggested that this mechanism can also account for such anomalies as the apparent 'overabundance' of the alkali metals in the gas phase.
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