Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...228..238p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 228, no. 1, Feb. 1990, p. 238-245.
Astronomy and Astrophysics
Astrophysics
27
Carbon, Extinction, Interstellar Matter, Ultraviolet Radiation, Astronomical Models, Cosmic Dust, Impurities, Interstellar Extinction, Porosity
Scientific paper
Improved models of carbonaceous grains are proposed to explain the UV interstellar extinction. The grains, traditionally considered as homogeneous or coated particles, are supposed to be inhomogeneous (i.e. with porosity or impurities). Using the dipole representation of a dust particle, it is shown that inhomogeneity within grains can produce significant shifts of the central wavelength of the UV interstellar bump, as well as variations in its width and strength. Also, in most cases, both shift in position and variation in width are found to be closely correlated. As a result, it seems difficult for the UV interstellar bump to be accounted for by carbonaceous grains alone.
Perrin Jean-Marie
Sivan Jean-Pierre
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