Porous interstellar grains

Details Porous interstellar grains Porous interstellar grains

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mnras.322..749i&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 322, Issue 4, pp. 749-756.

Astronomy and Astrophysics

Astronomy

15

Ism: Abundances, Dust, Extinction

Scientific paper

Recent observations of stellar composition suggest that elements in the Sun are significantly more abundant than in other stars. The reduction in the available element budget implies a drastic revision in current models of interstellar dust. Theoretical models are therefore exploring fluffy, porous physical structure for the grain material. Since a detailed exact treatment of extinction cross-sections is mandatory for a correct understanding of the nature of interstellar dust, we present a technique based on the multipole expansions of the electromagnetic field, which has proven to be general, flexible and powerful in treating scattering of light by porous, composite, arbitrarily shaped particles. The results of this study speak in favour of core-mantle structures characterized by the presence of porosities.

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