Interstellar extinction correlations

Details Interstellar extinction correlations Interstellar extinction correlations

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.229..213j&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 229, Nov. 15, 1987, p. 213-221.

Astronomy and Astrophysics

Astronomy

36

Astronomical Models, Cosmic Dust, Data Correlation, Grain Size, Interstellar Extinction, Interstellar Matter, Carbon, Silicates, Ultraviolet Spectra, Visible Spectrum

Scientific paper

A recently proposed model for interstellar grains (Duley et al., 1987) in which the extinction arises from small silicate cores with mantles (30-50 A thick) of hydrogenated amorphous carbon (HAC or alpha-C:H), and large, but thinly coated, silicate grains can successfully explain many of the observed properties of interstellar dust. The small silicate cores give rise to the 2200 A extinction feature (Steel and Duley, 1987). The extinction in the visual is produced by the large silicates and the HAC mantles on the small cores, while the far UV extinction arises in the HAC mantles with a small contribution from the silicate grains. The grain model requires that the silicate material is the more resilient component and that variations in the observed extinction from region to region are due to the nature and depletion of the carbon in the HAC mantles. It is shown that this new model of interstellar grains is consistent with the observed extinction correlations and can successfully account for the variations in interstellar extinction.

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