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

TL;DR

This study analyzes the spectral energy distribution of the cool carbon star DY Per, deriving its atmospheric parameters and chemical composition using spectral synthesis and molecular line lists.

Contribution

It provides detailed atmospheric parameters and chemical abundances of DY Per using multiple molecular line lists and spectral synthesis techniques.

Findings

Estimated Teff between 2900 and 3300 K

Star may be metal and hydrogen deficient

Maximum carbon abundance [C]=0.94

Abstract

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.