Optical properties of alpha silicon carbide

Details Optical properties of alpha silicon carbide Optical properties of alpha silicon carbide

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...194..335p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 194, no. 1-2, April 1988, p. 335-339.

Astronomy and Astrophysics

Astrophysics

109

Carbon Stars, Interstellar Matter, Late Stars, Optical Properties, Silicon Carbides, Stellar Envelopes, Dielectrics, Infrared Radiation, Kramers-Kronig Formula, Radiative Transfer, Refractivity

Scientific paper

Laboratory extinction spectra of grains of α silicon carbide are available which compare well with the astronomical observations. Unfortunately, these measurements are not sufficient to fully interpret the 11.5 μm feature profiles since radiative transer models require the knowledge of the complex refractive index of the circumstellar material over the whole electromagnetic spectrum. In order to fill in this gap, the author presents a complete dielectric function for this material computed from a Kramers-Kronig analysis of the above mentioned extinction spectra and other measurements of the index of refraction. These synthetic optical properties are shown to be satisfactorily consistent with the existing laboratory measurements and confirm the assignment of the feature exhibited by C-stars spectra to α-SiC.

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