Sp. follow-up of bright metal-poor stars

From these low-resolution (R~2000) spectra, we estimate stellar atmospheric parameters, as well as carbon and magnesium abundance ratios. We confirm that 56% of our program stars are metal-poor ([Fe/H]{<-}1.0), 30% are very metal-poor (VMP; [Fe/H]{<-}2.0), and 2% are extremely metal-poor (EMP; [Fe/H]{<-}3.0).

There are 191 carbon-enhanced metal-poor (CEMP) stars, resulting in CEMP fractions of 19% and 43% for the VMP and EMP regimes, respectively. A total of 94 confirmed CEMP stars belong to Group I (A(C)>~7.25) and 97 to Group II (A(C)<~7.25) in the Yoon-Beers A(C)-[Fe/H] diagram. Moreover, we combine these data with Gaia EDR3 astrometric information to delineate new target-selection criteria, which have been applied to the Goodman/SOAR candidates, to more than double the efficiency for identification of bona fide VMP and EMP stars in comparison to random draws from the B&B catalog.