The size distribution of dust grains in single clouds. II - The analysis of extinction using inhomogeneous grains

Details The size distribution of dust grains in single clouds. II - The analysis of extinction using inhomogeneous grains The size distribution of dust grains in single clouds. II - The analysis of extinction using inhomogeneous grains

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.294..548z&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 294, p. 548

Astronomy and Astrophysics

Astronomy

15

Particle Size Distribution, Grain Size, Interstellar Extinction, Molecular Clouds, Graphite, Interstellar Matter

Scientific paper

The extinction curves of single clouds, seen towards the stars HD 147165, 179406, and 202904, have been modelled using various mixtures containing both bare and inhomogeneous (composite and/or multilayer) grains. It has been shown that the models composed of the bare graphite and silicate grains together with the multilayer grains containing silicates, organic refractory, and water ice are more useful in explaining extinction under the reduced cosmic abundances. The models based on Mathis' composite grains or on Greenberg and Li's core-mantle grains can also provide quite good fits of the extinction and the measured scattering parameters but still require an excessive amount of carbon, which results in too large a C/O ratio. The inhomogeneous grains essentially contribute to the extinction in practically the whole wavelength range of our extinction curves. As a rule, such grains have quite wide size distributions, centered at around 100 nm, although graphite grains are mainly of small sizes.

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