| Issue |
A&A
Volume 428, Number 1, December II 2004
|
|
|---|---|---|
| Page(s) | 99 - 108 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361:20034137 | |
| Published online | 23 November 2004 | |
On the thermal behaviour of small iron grains*
Research School of Astronomy & Astrophysics, Institute of Advanced Studies, The Australian National University, Cotter Road, Weston Creek, ACT 2611, Australia e-mail: fischera@mso.anu.edu.au
Received:
31
July
2003
Accepted:
28
July
2004
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.
Key words: ISM: dust, extinction / ISM: general
© ESO, 2004
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