Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ap%26ss..34..191b&link_type=abstract
(Symposium on Solid State Astrophysics, Cardiff, Wales, July 9-12, 1974.) Astrophysics and Space Science, vol. 34, Apr. 1975, p.
Astronomy and Astrophysics
Astrophysics
1
Cosmic Dust, Graphite, Infrared Radiation, Silicates, Absorptivity, Astronomical Models, Emissivity, Ice, Temperature Effects
Scientific paper
Analytical approximations are investigated which are often used for calculating the IR absorption efficiency of dust grains. Comparisons are made between inverse-frequency and inverse-frequency-squared dependences for the average absorption efficiency of three grain models: pure graphite, ice mantle-graphite core, and silicates. The simplified expressions are found to be valid for silicate and graphite grains only when accuracies of 10 per cent to 50 per cent are required and only for grain temperatures above 80 K. At lower temperatures, the validity of the approximations will fail for graphite and will be variable for silicates. It is shown that the ice mantle-graphite core particles can be treated with the approximations without introducing appreciable errors.
Blanco Ariel
Borghesi A.
Bussoletti Ezio
Leggieri G.
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