Analysis of the spectral energy distribution of the coolest RCrB type carbon star DY Per

Yakovina, L. A.; Shavrina, A. V.; Pavlenko, Ya. V.; Pugach, A. F.

Analysis of the spectral energy distribution of the coolest RCrB type carbon star DY Per

Authors

Description

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 Teff to be in the range 2900 < Teff < 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: Tef=3100 K, [Fe/H] = 0, log(C/O)=0.6, [N/Fe] = 0, [H/He] = 0, with Jorgensen's line lists for the molecules C2 and CN.
4 pages, 2 tables, 3 figs, accepted by Odessa asronomical observatory Publ., 2009