Low Metallicity Stars in SDSS and SEGUE
Over the past half century, astronomers have identified on the order of 2000 Very Metal Poor (VMP) stars with [Fe/H] -2.0, and a few hundred Extremely Metal Poor (EMP) stars with [Fe/H] -3.0, primarily from two large objective prism surveys, the HK survey of Beers and collaborators and the Hamburg/ESO Survey of Christlieb and colleagues. High
Beers, T. C. et al.
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2005