ANALYSIS OF THE SPECTRAL ENERGY DISTRIBUTION OFTHE COOLEST RCrB TYPE CARBON STAR DY Per

Abstract

We analysed the spectral energy distribution of the evolved carbon star DY Per by spectral synthesis technique. The red giant shows the photometric features of R CrB type stars. We derived the atmosphere parameters of DY Per using three variants of molecular line lists. The range of Teff estimations is 2900 < Teff < 3300 K. We adopted log g = 0. The star can be metal deficient and hydrogen deficient. The highest value of carbon abundance [C]=0.94 provides the combination of atmosphere parameters {Teeff =3100 K, [Fe/H] =0, log(C/O)=0.6, [N/Fe]=0, (H/He)sun} with Jorgensen's line lists for molecules C2 and CN.