Interstellar shocks and elemental depletions

Details Interstellar shocks and elemental depletions Interstellar shocks and elemental depletions

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..85..221d&link_type=abstract

Astrophysics and Space Science, vol. 85, no. 1-2, July 1982, p. 221-230. Research supported by the Natural Sciences and Enginee

Astronomy and Astrophysics

Astrophysics

4

Abundance, Interstellar Matter, Molecular Clouds, Shock Wave Propagation, Amorphous Materials, Grains, Oxides, Propagation Velocity, Refractory Materials

Scientific paper

The variation in elemental depletions seen in diffuse clouds in the interstellar medium is shown to be consistent with the exposure of grains to weak shocks. Shocks remove a weakly bound layer of amorphous oxide material from refractory cores. Depletions are shown to be the result of the incorporation of elements in refractory cores found during equilibrium condensation in high temperature sources together with accretion under low (much less than 1000 K) temperature conditions. Evidence is presented for the high temperature condensation of CaAlTi grains. In addition to refractory CaAlTi particles, a refractory condensate containing 20% of available Mg, 60% of Si and 90% of Fe is inferred from data on depletions. An amorphous layer with a composition (2MgO) (SiO) condenses on these cores.

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