Stochastic evolution of refractory interstellar dust during the chemical evolution of a two-phase interstellar medium

Details Stochastic evolution of refractory interstellar dust during the chemical evolution of a two-phase interstellar medium Stochastic evolution of refractory interstellar dust during the chemical evolution of a two-phase interstellar medium

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...340..853l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 340, May 15, 1989, p. 853-868. Research supported by the Robert A. Welch Fo

Astronomy and Astrophysics

Astrophysics

19

Chemical Evolution, Cosmic Dust, Interstellar Matter, Stochastic Processes, Abundance, Molecular Clouds, Nuclear Fusion, Shock Waves, Star Formation

Scientific paper

The evolution course of refractoary interstellar dust during the chemical evolution of a two-phase interstellar medium (ISM) is studied using a simple model of the chemical evolution of ISM. It is assumed that, in this medium, the stars are born in molecular clouds, but new nucleosynthesis products and stellar return are entered into a complementary diffuse medium; the well-mixed matter of each interstellar phase is repeatedly cycled stochastically through the complementary phase and back. The dust is studied on a particle-by-particle bases as it is sputtered by shock waves in the diffuse medium, accretes an amorphous mantle of gaseous refractory atoms while its local medium joins the molecular cloud medium, and encounters the possibility of astration within molecular clouds. Results are presented relevant to the size spectrum of accreted mantles, its age spectrum and the distinction among its several lifetimes, depletion factors of refractory atoms in the diffuse gas, and isotopic anomalies.

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