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Silicon Carbide (SiC) optical constants are fundamental inputs for radiativetransfer models of astrophysical dust environments. However, previouslypublished values contain errors and do not adequately represent the bulkphysical properties of the cubic (beta) SiC polytype usually found aroundcarbon stars. We provide new, uncompromised optical constants for beta- andalpha-SiC derived from single-crystal reflectance spectra and investigatequantitatively whether there is any difference between alpha- and beta-SiC thatcan be seen in infrared spectra and optical functions.  Previous optical constants for SiC do not reflect the true bulk properties,and they are only valid for a narrow grain size range. The new opticalconstants presented here will allow narrow constraints to be placed on thegrain size and shape distribution that dominate in astrophysical environments.In addition, our calculated absorption coefficients are much higher thanlaboratory measurements, which has an impact on the use of previous data toconstrain abundances of these dust grains.

Optical properties of silicon carbide for astrophysical applications I. New laboratory infrared reflectance spectra and optical constants