Proc. IAU volume 13, issue S334, P389-390 2017 DOI: 10.1017/s174392131700792x View full text
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Jinmi Yoon, Devin D. Whitten, Timothy C. Beers, Vinicius M. Placco, Young Sun Lee, Sarah Dietz, Dmitrii Gudin, Kaitlin C. Rasmussen

Abstract: The study of extremely metal-poor (EMP; [Fe/H] < −3.0) and ultra metal-poor (UMP; [Fe/H] < −4.0) stars is crucial for better understanding first-star nucleosynthesis and constraining the initial mass function in the early Universe. However, UMP stars discovered in the past 25 years only number ∼25. A few recent theoretical studies have pointed out that there is likely to exist large numbers of EMP and UMP stars in the periphery of the Galactic halo, at distances exceeding 30-50 kpc. We present identifications …

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