Astronomy departmental seminar - Tadafumi Matsuno (Groningen)


Chemical evolution of disrupted dwarf galaxies in the Milky Way

Thanks to the Gaia mission, we can now identify promising candidates for dwarf galaxies that have been accreted and disrupted by the Milky Way as substructures in stellar kinematics.  In this talk, I will briefly summarize a method to identify these kinematic substructures and discuss our efforts to characterize the detailed chemical abundances of stars selected as their members.  We reveal distinct differences in abundance ratios among kinematic substructures, which can be attributed to varying contributions by type Ia supernovae in their chemical enrichments.  Additionally, I will show that the chemical abundance ratios of these kinematic substructures offer a unique opportunity to test our understanding of nucleosynthesis of elements.