  A line list of vibration-rotation transitions for 13C substituted HCN is
presented. The line list is constructed using known experimental levels where
available, calculated levels and ab initio line intensities originally
calculated for the major isotopologue. Synthetic spectra are generated and
compared with observations for cool carbon star WZ Cas. It is suggested that
high resolution HCN spectra recorded near 14 micron should be particularly
sensitive to the 13C to 12C ratio.
