Oxygen abundances in low- and high-alpha field halo stars and the discovery of two field stars born in globular clusters

"Important clues to understand the formation and evolution of the Milky Way’s halo and disk components, as well as any possible connections between them, are imprinted in the photospheric chemical composition of FGK-type dwarf stars. These objects have probably retained the chemical composition of the gas from which they formed, thus being excellent tracers of Galactic chemical evolution (GCE).Moreover, their long lifetimes, in particular for the G and K types, allow us to probe the Milky Way’s GCE over many billions of years. Consequently, combined with kinematics and information on stellar ages, chemical composition analyses of FGK dwarf stars have the potential to be useful for reconstructing the history of our Galaxy." arXiv