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

https://doi.org/10.3847/1538-3881/ac5835

Ray, Amy E. ; Frinchaboy, Peter M. ; Donor, John ; Chojnowski, S. D. ; Melendez, Matthew ( April 2022 , The Astronomical Journal)

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) Cerro Tololo Inter-American Observatory/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 Sloan Digital Sky Survey/Apache Point Observatory Galactic Evolution Experiment 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.

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The Fourteenth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the Extended Baryon Oscillation Spectroscopic Survey and from the Second Phase of the Apache Point Observatory Galactic Evolution Experiment

https://doi.org/10.3847/1538-4365/aa9e8a

Abolfathi, Bela ; Aguado, D. S. ; Aguilar, Gabriela ; Prieto, Carlos Allende ; Almeida, Andres ; Ananna, Tonima Tasnim ; Anders, Friedrich ; Anderson, Scott F. ; Andrews, Brett H. ; Anguiano, Borja ; et al ( April 2018 , The Astrophysical Journal Supplement Series)

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