Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976mnras.176..539p&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 176, Sept. 1976, p. 539-545.
Astronomy and Astrophysics
Astronomy
13
Absorption Cross Sections, Chemical Composition, Infrared Reflection, Interstellar Matter, Particle Size Distribution, Planetary Nebulae, Abundance, Calcium Carbonates, Cosmic Dust, Line Spectra, Magnesium, Mie Scattering, Minerals, Seyfert Galaxies, Silicon Carbides, Spectral Reflectance, Thermal Emission
Scientific paper
Middle-infrared reflectivities have been measured for three nonsilicate minerals. Kramers-Kronig analysis and Mie theory have been used to calculate absorption cross sections for small particles of the minerals. The results of these calculations are compared with features observed in astronomical spectra and attributed to thermal emission from carbonate and sulphate grains. The identification of carbonates and sulphates is confirmed, and estimates are made of the masses of grains necessary to account for the features observed. Some grain materials are ruled out as responsible for a double-peaked feature in the spectra of two planetary nebulae and a Seyfert galaxy.
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