Formation and Destruction of Grains
Refractory grains, consisting of graphite, SiC, silicate and iron particles, may form in mass flows from cool stars, novae and possibly supernovae. Tarry polymeric mantles (typified by polyoxymethylene copolymers) grow under conditions which prevail in massive molecular clouds. A large fraction of polymer-coated grains could be expelled into the general interstellar medium, and such grains could be responsible for the bulk of the observed interstellar extinction at optical wavelengths. Grain destruction occurs mainly by direct involvement in star formation.
KeywordsStar Formation Molecular Cloud Interstellar Extinction Cool Star Dielectric Particle
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