The optical properties of dust in the mid-IR silicate bands

Details The optical properties of dust in the mid-IR silicate bands The optical properties of dust in the mid-IR silicate bands

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...142..451p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 142, no. 2, Jan. 1985, p. 451-460.

Astronomy and Astrophysics

Astronomy

49

Cosmic Dust, Interstellar Matter, Optical Properties, Protostars, Stellar Spectrophotometry, Supergiant Stars, Emission Spectra, Infrared Astronomy, Interstellar Extinction, Silicates, Stellar Envelopes

Scientific paper

A study of the emission silicate features of 10 supergiants and S Lep, which are all in the solar region of the Galaxy, is discussed. The optical efficiency of the circumstellar grain material of M stars is deduced over the range 8-30 microns. It is shown that the efficiency clearly peaks at 10 microns and is analogous to that of amorphous Mg2SiO4. A similar procedure, using 13 available spectra of protostellar objects, shows that the dust in molecular clouds and in the ISM, is composed of small (less than 1 micron) grains with an optical extinction efficiency peaking at 9.5 microns and practically identical to that of amorphous MgSiO3. Combining the two kinds of dust, and allowing for grain sizes greater than 1 micron, it is possible to reproduce the wide 10-micron features emitted by M giants with more or less thick shells. Using the results of meteoritic chemical analysis and of the theory of composite gas condensation, the likelihood of amorphous MgSiO4 and MgSiO3 being present in circumstellar and interstellar dust, respectively, is evaluated.

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