The Open Cluster Chemical Abundances and Mapping Survey: V. Chemical Abundances of CTIO/Hydra Clusters using The Cannon

TL;DR

This study uses medium-resolution spectra and The Cannon to determine chemical abundances in 58 open clusters, providing new metallicity data and calibrating measurements to improve understanding of Milky Way evolution.

Contribution

It introduces a uniform analysis of open cluster abundances using The Cannon, expanding the dataset with new metallicities and calibration to SDSS/APOGEE standards.

Findings

Spectroscopic metallicities for 35 clusters are presented for the first time.

The analysis includes 58 clusters, with 55 calibrated to SDSS/APOGEE DR16.

Comparison with previous studies shows consistency and improvements.

Abstract

Open clusters are key chemical and age tracers of Milky Way evolution. While open clusters provide significant constraints on galaxy evolution, their use has been limited due to discrepancies in measuring abundances from different studies. We analyze medium resolution (R~19,000) CTIO/Hydra spectra of giant stars in 58 open clusters using The Cannon to determine [Fe/H], [Mg/Fe], [Si/Fe], [Al/Fe], and [O/Fe]. This work adds an additional 55 primarily southern hemisphere open clusters calibrated to the SDSS/APOGEE DR16 metallicity system. This uniform analysis is compared to previous studies [Fe/H] measurements for 23 clusters and we present spectroscopic metallicities for the first time for 35 open clusters.