Journal Article

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

V. G. Zubko, J. Krelowski and W. Wegner

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 294, issue 4, pages 548-556
Published in print March 1998 | ISSN: 0035-8711
Published online March 1998 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-8711.1998.01048.x
The size distribution of dust grains in single clouds — II. The analysis of extinction using inhomogeneous grains

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Abstract

The extinction curves of single clouds, seen towards the stars HD 147165, 179406 and 202904, have been modelled using various mixtures containing both the 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 & 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, centred at around 100 nm, although graphite grains are mainly of small sizes.

Keywords: stars: individual: HD 147165; stars: individual: HD 179406; stars: individual: HD 202904; ISM: clouds; dust, extinction

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Subjects: Astronomy and Astrophysics

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