Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206..691j&link_type=abstract
Astrophysical Journal, vol. 206, June 15, 1976, pt. 1, p. 691-698.
Astronomy and Astrophysics
Astrophysics
46
Abundance, Gaseous Diffusion, Interstellar Matter, Shock Wave Profiles, Calcium, Granular Materials, Hydrogen Clouds, Interstellar Gas, Particle Collisions, Shock Wave Propagation
Scientific paper
Observations are discussed which show that the Na I/H2 column-density ratio is relatively constant among different clouds where H2 is optically thin, but the Na I/Ca II column-density ratio varies. This implies that the gas-phase abundance of calcium is variable. It is proposed that the wide variation in the gas-phase calcium abundance can be explained by small variations in the calcium content of grains. The observed enhancement of the Ca II/Na I column-density ratio with cloud velocity is attributed to grain destruction in grain-grain collisions within the same cloud. The structure of shock waves propagating through the interstellar gas is computed, and the grain-destruction model is compared with observational data.
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