Speaker
Description
The SDSS-V Milky Way Mapper halo program will obtain spectra of hundreds of thousands of stars in the local halo, distant halo, and metal-poor halo. The halo working group has a spectroscopic follow up program to investigate the most interesting stars identified based on their kinematics or chemistry, with a focus on metal-poor low-alpha stars that likely accreted onto the Milky Way in low mass dwarf galaxies. I will present early results from this ongoing search. One of the stars has a spectacular chemical composition: extreme odd-even ratios, enhanced iron-peak elements, and a unique neutron-capture element pattern. Despite having relatively high metallicity [Fe/H] = -1.8, the chemical composition strongly suggests this star formed out of gas predominantly enriched by metal-free Population III stars. The early discovery of a star with such unique composition bodes well for many more interesting stars to be identified in Milky Way Mapper.
