Optical Properties of Dust Grains

Details Optical Properties of Dust Grains Optical Properties of Dust Grains

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.179..259e&link_type=abstract

Astrophysics and Space Science, Vol.179, NO. 2/MAY, P.259, 1991

Astronomy and Astrophysics

Astrophysics

2

Scientific paper

In this paper we present new and exact analytical and computational developments of Güttler's formulae for composite grains, thereafter applied for the two models: (1) Graphite core-ice mantle. (2) Silicate core-ice mantle. Literal and analytical expressions have been established for the Riccati-Bessel of the complex functions ct'~~ ~, and ~ and their derivatives. The problem is treated in its general form without any restriction and the computer programme is now ready for request. Comparison for our results with others obtained via approximate equations proves clear differences. The first model agrees with Isobe (1975) although another approach has been used in the current work. For our knowledge there are no such previous accurate calculations for the second model

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