Evolving Optical Properties of Annealing Silicate Grains: From Amorphous Condensate to Crystalline Mineral

Details Evolving Optical Properties of Annealing Silicate Grains: From Amorphous Condensate to Crystalline Mineral Evolving Optical Properties of Annealing Silicate Grains: From Amorphous Condensate to Crystalline Mineral

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...535..247h&link_type=abstract

The Astrophysical Journal, Volume 535, Issue 1, pp. 247-255.

Astronomy and Astrophysics

Astronomy

69

Subject Headings: Stars: Circumstellar Matter, Ism: Dust, Extinction, Ism: Molecules, Methods: Laboratory, Molecular Processes

Scientific paper

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 outflow. Optical constants for the magnesium silicate smoke samples compatible with those of Draine & Lee are derived over the range 0.001-1000 μm.

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