The observed infrared properties of grains in space

Astronomy and Astrophysics – Astronomy

Scientific paper

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Condensates, Cosmic Dust, Infrared Astronomy, Infrared Spectra, Interstellar Matter, High Temperature, Ice Nuclei, Interstellar Chemistry, Low Temperature, Silicates, Silicon Carbides, Spectral Bands, Variable Stars

Scientific paper

The infrared properties of dust in space, as inferred from infrared observations at low to moderate spectral resolution at wavelengths of less than or about 30 microns are summarized. Condensates at high temperature (featureless material and silicon carbide), moderate temperature (silicates), and low temperature (ices) are briefly discussed. Strong band emission from as-yet unknown species has been detected in a variety of objects. Episodes of rapid dust formation have been recorded in the infrared spectra of certain eruptive variable stars, including classical novae. Observations of this class of object promises to provide information on grain nucleation and growth.

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