Volume 375, Number 2, August IV 2001
|Page(s)||584 - 590|
|Published online||15 August 2001|
Interstellar extinction by composite grains
Gujarat College, Ahmedabad 380009, India e-mail: email@example.com
2 IUCAA, Post Bag 4, Ganeshkhind, Pune 411007, India
3 Dept. of Physics, Dalhousie University, Halifax, Nova Scotia, B3H 3J5 Canada
Corresponding author: R. Gupta, firstname.lastname@example.org
Accepted: 14 June 2001
Recent studies indicate that interstellar grains are composites of very small individual particles of silicates and carbon glued together into an aggregate. Using the discrete dipole approximation (DDA), we calculate the extinction, scattering and absorption efficiencies for composite grains assumed to be made of a host silicate sphere with embedded graphite inclusions. In particular, we study the extinction as a function of inclusion size and volume fraction. Using the extinction efficiencies of these composite grains, we evaluate the interstellar extinction curve in the wavelength region of .
Key words: ISM: dust, extinction
© ESO, 2001
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