The violet opacity in the red peculiar stars (I)

Moderate dispersion (25–35 Å mm^–1) spectra were obtained from two carbon stars, LW Cyg and Y Tau, in a wide range of wavelengths ( 3400–6800 Å) with the 6 m echellespectrometer ZEBRA and two dimensional photon-counting system. Spectral feature identification was carried out from 3800 to 6300 Å. Most of the bands are due to C₂, CN, and SiC₂, however, atomic lines of the iron peak and s-process element also are represented. LW Cyg have intense isotopic carbon bands. The wavelengths and band-intensity were estimated.