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

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

2009-05-27

arxiv.org/abs/0905.4344v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

4 pages, 2 tables, 3 figs, accepted by Odessa asronomical observatory Publ., 2009

Scientific paper

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.

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