Mathematics – Logic
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988ioch.rept..184s&link_type=abstract
In NASA, Washington, Infrared Observations of Comets Halley and Wilson and Properties of the Grains p 184-185 (SEE N89-13330 04-
Mathematics
Logic
Astronomical Models, Cosmic Dust, Emission Spectra, Halley'S Comet, Infrared Spectra, Absorption Cross Sections, Carbonaceous Materials, Cometary Atmospheres, Particle Size Distribution, Silicates, Spectrum Analysis
Scientific paper
A model based on a mixture of coated silicates and amorphous carbon grains produces a good spectral match to the available Halley data and is consistent with the compositional and morphological information derived from interplanetary dust particle studies and Halley flyby data. The dark appearance of comets may be due to carbonaceous coatings on the dominant (by mass) silicates. The lack of a 10 micrometer feature may be due to the presence of large silicate grains. The optical properties of pure materials apparently are not representative of cometary materials. The determination of the optical properties of additional silicates and carbonaceous materials would clearly be of use.
Allamandola Louis J.
Bregman Jesse D.
Krishna Swamy K. S.
Sandford Scott A.
Witteborn Fred. C.
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