A detailed spectroscopic analysis of the open cluster NGC 5460

TL;DR

This study provides a detailed spectroscopic analysis of 21 stars in the open cluster NGC 5460, revealing nearly solar metallicity, temperature-dependent abundance patterns, and discovering peculiar stars, thereby enhancing understanding of stellar compositions in this cluster.

Contribution

First detailed spectroscopic abundance analysis of NGC 5460, identifying temperature-related abundance trends and peculiar stars, with new estimates of cluster parameters.

Findings

Cluster has nearly solar metallicity.

Magnesium and iron abundances peak around 10500 K.

Discovered two He-weak stars and a binary with a HgMn star.

Abstract

Within the context of a large project aimed at studying early F-, A- and late B-type stars we present the abundance analysis of the photospheres of 21 members of the open cluster NGC 5460, an intermediate age cluster (logt ~ 8.2) previously unstudied with spectroscopy. Our study is based on medium and high resolution spectra obtained with the FLAMES instrument of the ESO/VLT. We show that cluster members have a nearly solar metallicity, and that there is evidence that the abundances of magnesium and iron are correlated with the effective temperature, exhibiting a maximum around Teff=10500 K. No correlations are found between abundances and projected equatorial velocity, except for marginal evidence of barium being more abundant in slower than in faster rotating stars. We discovered two He-weak stars, and a binary system where the hotter component is a HgMn star. We provide new estimates for the cluster distance (720 +/- 50 pc), age (logt = 8.2 +/- 0.1), and mean radial velocity (-17.9 +/- 5.2 km/s).