Chemical abundance analysis of CP Cyg and HD 33266

Abstract

We selected two neglected A-type stars with low rotational velocity (v sin i < 20 km s −1) to reveal their chemical composition. Our abundance analysis was based on high resolution spectra of CP Cyg and HD 33266, obtained at the Tubitak National Observatory (TUG). We determined the fundamental parameters of our target stars from traditional methods. We also measured the abundances of 19 elements for CP Cyg and 20 for HD 33266 from the unblended lines emerging in the optical region of our spectra. The results of the analysis show that CP Cyg is a chemically normal A-type star, while HD 33266 is a metallic-line (Am) star. This is the first study in which HD 33266 is classified as a hot Am star. We also plotted the stars on the H-R diagram and calculated the masses from evolutionary tracks and ages from isochrones. We then compared both stars with members of similar ages and atmosphere parameters that belong to Coma Berenices and Hyades clusters. Our study is 6 Based on observations made at the Tubitak National Observatory, Turkey (Program IDs 09BRTT150-477-0). useful to understand the physical processes inside the atmospheres of chemically normal and peculiar A-type stars as well as their origin.