Experimental extinction properties of granular mixtures of silicon carbide and amorphous carbon

Details Experimental extinction properties of granular mixtures of silicon carbide and amorphous carbon Experimental extinction properties of granular mixtures of silicon carbide and amorphous carbon

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...252..315o&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 252, no. 1, Dec. 1991, p. 315-319. Research supported by MPI, CNR, and ASI.

Astronomy and Astrophysics

Astrophysics

14

Carbon, Carbon Stars, Gas Mixtures, Interstellar Extinction, Silicon Carbides, Stellar Envelopes, Abundance, Amorphous Materials, Astronomical Spectroscopy, Cosmic Dust, Infrared Radiation

Scientific paper

Laboratory data on the infrared extinction properties of mixtures composed of amorphous carbon (AC) and silicon carbide (SiC) submicron grains, relevant to the study of dust envelopes around C-rich stars are reported. It is experimentally verified that the extinction spectra of such mixtures can be conveniently evaluated simply by using those derived for the single components. Extrapolation of laboratory data to vacuum has been done starting from infrared spectra of grains embedded in different matrices (KBr) and (CsI). A first application of the data to the infrared spectrum of a typical IR source GL 799 suggests the presence of AC and SiC (both alpha and beta) particles in its shell. The relative amounts of the three components are in agreement with the elemental abundances in the envelopes around carbon-rich stars.

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