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

Journal Article · Mon May 01 04:00:00 EDT 1989 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/167440· OSTI ID:5582176

Liffman, K; Clayton, D D ^[1]

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1. NASA, Ames Research Center, Moffett Field, CA (USA)

The evolution course of refractory 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. 26 refs.

• OSTI ID: 5582176
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 340; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
AGE ESTIMATION
CHEMISTRY
COSMIC DUST
COSMIC GASES
COSMOCHEMISTRY
DUSTS
FLUID FLOW
FLUIDS
GALACTIC EVOLUTION
GASES
GRAVITATIONAL COLLAPSE
INTERSTELLAR SPACE
ISOTOPE RATIO
MATHEMATICAL MODELS
MOLECULES
NUCLEOSYNTHESIS
SHOCK WAVES
SPACE
STAR EVOLUTION
STOCHASTIC PROCESSES
SYNTHESIS
TWO-PHASE FLOW