Abstract
Laboratory studies of the evolution of a magnesium silicate smoke from an amorphous condensate to a crystalline mineral by annealing in vacuum provide a foundation for the development of a silicate evolution index (SEI). The SEI can be used to predict the emergent IR spectrum of silicate dust in a circumstellar shell based on the time-temperature history of the silicate grains in the out—ow. Optical constants for the magnesium silicate smoke samples compatible with those of Draine & Lee are derived over the range 0.001¨1000 km. Subject headings: circumstellar matterdust, extinctionISM: moleculesmethods: laboratory ¨ molecular processes
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