Speaker
Description
Understanding the origin and evolution of carbon, nitrogen, and oxygen (CNO) is key to reconstructing the chemical history of the Milky Way and its earliest star-forming environments.
Within the framework of the larger DAINA CNO project, in collaboration with Poland and Lithuania, we aim to trace the enrichment of these elements across Galactic populations through a homogeneous, high-precision abundance analysis.
As a first step, we focus on the metal-poor regime ([Fe/H] < −2.0), selecting stars with high-resolution archival UVES spectra covering wavelength regions suitable for CNO measurements. Our initial sample includes both field stars and globular cluster members (372 stars), allowing us to explore similarities and differences in early chemical enrichment channels.
We present preliminary results on oxygen abundances at the metal-poor end of the Galaxy, providing new constraints on nucleosynthesis and chemical enrichment during the earliest phases of Galactic formation. These results are particularly relevant in light of recent JWST discoveries of N/O-enhanced galaxies at high redshift, which may share chemical signatures with ancient stellar populations and globular clusters. By linking local metal-poor stars to these distant systems, our work offers a bridge between near-field Cosmology by Galactic archaeology and the early Universe observed with JWST.