We analyse the spectral energy distribution of the evolved carbon giant DY Per with a spectral synthesis technique .
The red giant shows the photometric features of R CrB type stars .
We derive the atmospheric parameters of DY Per using three variants of molecular line lists .
We estimate T _ { eff } to be in the range 2900 < T _ { eff } < 3300 K. We adopted log g = 0 .
The star may be metal deficient and hydrogen deficient .
The maximum possible carbon abundance in the star , [ C ] =0.94 , provides the following atmospheric parameters : { T _ { eff } =3100 K , [ Fe/H ] =0 , log ( C/O ) = 0.6 , [ N/Fe ] = 0 , [ H/He ] = 0 , with Jorgensen ’ s line lists for the molecules C _ { 2 } and CN .