Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.234..209j&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 234, Sept. 15, 1988, p. 209-218.
Astronomy and Astrophysics
Astronomy
37
Astronomical Models, Cosmic Dust, Interstellar Extinction, Interstellar Matter, Silicates, Chemical Composition, Far Ultraviolet Radiation, Grain Size, Morphology, Porous Materials, Solid Phases
Scientific paper
Several methods of calculating the extinction of porous silicate grains are discussed, these include effective medium theories and hollow spherical shells. Porous silicate grains are shown to produce enhanced infrared, ultraviolet and far-ultraviolet extinction and this effect can be used to reduce the abundance of carbon required to match the average interstellar extinction, however, matching the visual extinction is rather more problematical. The author shows that the enhanced extinction at long and short wavelengths have different origins, and explains why the visual extinction is little affected by porosity. The implications of porous grains in the interstellar medium are discussed with particular reference to surface chemistry, the polarization of starlight, and their dynamical evolution.
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