106.03 Using photometrically selected metal-poor stars to study dwarf galaxies and the Galactic stellar halo (Kris Youakim)

Date & Time

Jun 4th at 11:10 AM until 11:25 AM




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Author(s): Kris Youakim1, Else Starkenburg1, Nicolas Martin2
Institution(s): 1. Leibniz-Institut f_r Astrophysik Potsdam, 2. Observatoire astronomique de Strasbourg
Contributing team(s): Pristine team
The Pristine survey is a narrow-band photometric survey designed to efficiently search for extremely metal-poor (EMP) stars. In the first three years of the survey, it has demonstrated great efficiency at finding EMP stars, and also great promise for increasing the current, small sample of the most metal-poor stars. The present sky coverage is ~2500 square degrees in the Northern Galactic Halo, including several individual fields targeting dwarf galaxies. By efficiently identifying member stars in the outskirts of known faint dwarf galaxies, the dynamical histories and chemical abundance patterns of these systems can be understood in greater detail. Additionally, with reliable photometric metallicities over a large sky coverage it is possible to perform a large scale clustering analysis in the Milky Way halo, and investigate the characteristic scale of substructure at different metallicities. This can reveal important details about the process of building up the halo through dwarf galaxy accretion, and offer insight into the connection between dwarf galaxies and the Milky Way halo. In this talk I will outline our results on the search for the most pristine stars, with a focus on how we are using this information to advance our understanding of dwarf galaxies and their contribution to the formation of the Galactic stellar halo.