A Comparison of the Chemical Composition of Main Sequence and Giant Stars in the Open Cluster NCC 752

Abstract

The chemical composition of stars in open clusters provides the best information on the chemical evolution of stars via comparison of the main sequence stars with the evolved giants. This is a case study of the abundances in the dwarfs and giants in the old, open cluster, NGC 752. It is also a pilot program for automated abundance determinations, including equivalent width measurements, stellar parameter determinations, and abundance analysis. We have found abundances of 31 element-ion combinations in 23 dwarfs and 6 giants. The mean cluster abundance of Fe is solar with [Fe/H]$=-0.01\pm 0.06$ with no significant difference between the dwarfs and giants. We find that the cluster abundances of other elements, including alpha-elements, to be at, or slightly above solar levels. We find some evidence for CNO processing in the spectra of the giants. The enhancement of Na in giants indicates that the NeNa cycle has occurred. The abundances of Mg and Al are similar in the dwarfs and giants indicating that the hotter MgAl cycle has not occurred. We find no evidence of s-process enhancements in the abundances of heavy elements in the giants.

33 pages, 13 figures

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• Chemical Abundances Of Open Clusters From High-Resolution Infrared Spectra. II. NGC 752
• Lithium and Beryllium in NGC 752 -- An Open Cluster Twice the Age of the Hyades
• UOCS. XIV. Uncovering extremely low mass white dwarfs and blue lurkers in NGC 752
• Stellar Population Astrophysics (SPA) with the TNG: NLTE atmospheric parameters and abundances of giant stars in 33 Open Clusters
• Evolved Eclipsing Binaries and the Age of the Open Cluster NGC 752
• A uvbyCaHbeta CCD Analysis of the Open Cluster Standard, M67,and its Relation to NGC 752
• Detailed Abundances of Planet-Hosting Open Clusters. The Praesepe (Beehive) Cluster