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Carl Covatto, P.A. Aannestad (ASU)
The outflows of cool stars are driven by radiation pressure on the dust component which transfers momentum to the gas component through collisions. The gas and dust are treated as a two component fluid and the outflow is assumed to be stationary. We use the method of Krüger, Woitke, and Sedlmayr (1995, A&AS, 113, 593) to track the evolution of a sample of silicate grains that initially has an MRN distribution and is being modified by nonthermal sputtering. The size distribution of dust grains as a function of radial position in the outflow will be presented.