Statistics – Computation
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ap%26ss.159..189s&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 159, no. 2, Sept. 1989, p. 189-201.
Statistics
Computation
42
Computational Astrophysics, Interstellar Extinction, Mie Scattering, Cosmic Dust, Light Scattering, Near Infrared Radiation, Spectral Energy Distribution, Stellar Spectra
Scientific paper
The results of the calculations of anomalous interstellar extinction laws characterized by different values of the ratio of the total to selective extinction are presented. The calculation is based on the Mie theory of light scattering by small particles assuming a two-grain dust model of Mathis et al. (1977) and by adopting their particle size distribution, in which the minimum and maximum size is taken to be 0.005 and 0.22 micron, respectively. Furthermore, dielectric functions for both the graphite- and 'astronomical silicate'-type grains are used, as derived by Draine and Lee (1984). Following Mathis and Wallenhorst (1981), the anomalous extinction laws are then obtained by changing the upper size cutoff of the particles. A comparison shows that the calculated anomalous extinction laws agree quite well with the laws observationally derived using the color-difference method. A trial-and-error method for the determination of the law, based on a comparison of the observed extinction-free spectral energy distribution with the corresponding theoretical Kurucz (1979) model, is explained.
Steenman H.
Thé Pik-Sin
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