Lifting the Veil on Ultra Metal-Poor Stars in the Outermost Halo

• DOI: 10.1017/s174392131700792x
• Publication Date: 2018-08-03T05:02:53Z
• Authors: Jinmi Yoon; Devin D. Whitten; Timothy C. Beers; Vinicius M. Placco; Young Sun Lee; Sarah Dietz; Dmitrii Gudin; Kaitlin C. Rasmussen
• Keywords: Initial mass function

Abstract The study of extremely metal-poor (EMP; [Fe/H] <−3.0) and ultra (UMP; <−4.0) stars is crucial for better understanding first-star nucleosynthesis constraining the initial mass function in early Universe. However, UMP discovered past 25 years only number ~25. A few recent theoretical studies have pointed out that there likely to exist large numbers EMP periphery Galactic halo, at distances exceeding 30-50 kpc. We present identifications several new EMP/UMP introduce a survey expedite discovering hundreds thousands outermost halo (as well as local volume) over next years, which could revolutionize chemical-evolution Galaxy.