Galactic Archaeology with Metal-Poor stars in the Gaia era — Lorenzo Monaco (Universidad Andres Bello)

Metal-poor stars are valuable fossils of the earliest epochs of Galaxy formation and of the first episodes of star formation. They preserve the imprint of primordial nucleosynthesis that occurred a few minutes after the Big Bang and are typically associated with the Galactic halo. The advent of the Gaia mission has enabled a new characterization of the Milky Way halo, particularly of its substructures, and has allowed for kinematic selection of candidate halo stars. I will present (1) measurements of beryllium abundances in a sample of stars belonging to the Thamnos halo substructure. The enhanced Be abundances observed point to a highly energetic event in which fast CNO nuclei fragmented upon collision with the surrounding medium. I will also present (2) results from a FORS/VLT spectroscopic campaign, aimed at characterizing a sample of kinematically selected halo stars. In particular, the sample includes a group of metal-poor stars confined to the Bulge region, as well as a group of apparently young metal-poor stars.

Horarios: 28 Apr 2026

Publicado por: Gijs Mulders