Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 737, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/737/1/L6
Keywords
astrochemistry; circumstellar matter; methods: numerical; stars: AGB and post-AGB; stars: winds, outflows
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Funding
- NASA
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Classical nucleation theory (CNT) has been used in models of dust nucleation in circumstellar outflows around oxygen-rich asymptotic giant branch stars. One objection to the application of CNT to astrophysical systems of this sort is that an equilibrium distribution of clusters (assumed by CNT) is unlikely to exist in such conditions due to a low collision rate of condensable species. A model of silicate grain nucleation and growth was modified to evaluate the effect of a nucleation flux orders of magnitude below the equilibrium value. The results show that a lack of chemical equilibrium has only a small effect on the ultimate grain distribution.
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