| Issue |
A&A
Volume 375, Number 2, August IV 2001
|
|
|---|---|---|
| Page(s) | 584 - 590 | |
| Section | The Sun | |
| DOI | https://doi.org/10.1051/0004-6361:20010867 | |
| Published online | 15 August 2001 | |
Interstellar extinction by composite grains
1
Gujarat College, Ahmedabad 380009, India e-mail: vaidya@iucaa.ernet.in
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, rag@iucaa.ernet.in
Received:
11
December
2000
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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