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EXTINCTION BY POROUS SILICATE AND GRAPHITE GRAINS

Deepak B. Vaidya, Ranjan Gupta

Abstract

Discrete dipole approximation (DDA) is used to cal- culate extinction efciencies of porous silicate and graphite grains. We apply DDA rst to the spheroidal solid grains as- sumed to be made of a large number of small scattering ele- ments (dipoles). Then we systematically reduce the number of dipoles to model the porous grains. The extinction is studied as a function of wavelength, grain size and porosity for both silicate and graphite grains. Finally the extinction efciencies of the porous silicate and graphite grains are used to evaluate the interstellar extinction curve which is found to t well with the average observed extinction curve.

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Key concepts: Extinction (optical mineralogy), Discrete dipole approximation, Silicate, Graphite, Porosity, Physics, Scattering, Astrophysics