Statistics – Computation
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...251..210o&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 1, Nov. 1991, p. 210-219.
Statistics
Computation
67
Cosmic Dust, Interstellar Matter, Optical Properties, Absorption Spectra, Computational Astrophysics, Rayleigh Equations
Scientific paper
The description of the optical properties of inhomogeneous dust grains is an important task in many astrophysical problems. It is shown that effective medium theories are an appropriate tool for this purpose. The theories are improved to treat aggregates of particles with various shapes, with anisotropic dielectric constants and of core-mantle grains. Furthermore, the formation of extended structures at high volume concentrations of the components and magnetic effects are included. The influence of magnetic absorption in composite media is investigated. The optical behavior of fractal dust grains is computed. It is shown that fractal aggregation increases the absorption of cosmic dust grains at infrared wavelengths and leads to a shift of some absorption features. The absorption spectrum of a size distribution of fractal grains is strongly influenced by the behavior of particles with medium volume fraction of vacuum. Other spherical shapes of the subgrains in fractal aggregates may considerably influence their absorption spectrum.
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