Journal
ASTRONOMY & ASTROPHYSICS
Volume 428, Issue 1, Pages 99-U35Publisher
E D P SCIENCES
DOI: 10.1051/0004-6361:20034137
Keywords
ISM : dust, extinction; ISM : general
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The optical properties of small spherical iron grains are derived using a Kramers-Kronig-consistent model of the dielectric function including its dependence on temperature and size. Especially discussed is the effect of the size dependence, which results from the limitation of the free path of the free electrons in the metal by the size of the grain, on the absorption behaviour of small iron spheres and spheroids. The estimated absorption properties are applied to study the temperature behaviour of spherical and spheroidal grains which are heated by the interstellar radiation field.
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