Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ap%26ss..35...97z&link_type=abstract
Astrophysics and Space Science, vol. 35, June 1975, p. 97-115.
Astronomy and Astrophysics
Astrophysics
35
Absorption Spectra, Cosmic Dust, Infrared Spectra, Interstellar Extinction, Interstellar Matter, Silicates, Abundance, Astronomical Spectroscopy, Carbonaceous Meteorites, Minerals, Olivine, Pyroxenes
Scientific paper
The composition of the interstellar silicate dust is investigated. Condensation or alteration of silicate grains at temperatures of a few hundred degrees, in the presence of H2O, would result in hydrous or phyllosilicates, the silicate type most abundant in the type I carbonaceous chondrites. Infrared spectra of small particles (about 0.1 microns) of the high temperature condensates, olivine and pyroxene, at 300 K and 4 K do not give a good match to the interstellar absorption band near 9.8 microns. Laboratory spectra of several phyllosilicates give better agreement as does the spectrum of a carbonaceous chondrite. We propose that the silicates in the interstellar grains are predominantly phyllosilicates and suggest additional spectral tests for this hypothesis.
Knacke Roger F.
Porco Carolyn C.
Zaikowski Anthony
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