The LBT $Y_{\mathrm{p}}$ Project I: An Improved Determination of the Primordial Helium Abundance -- Project Description, Sample Selection, Observations, and Methodology

Evan D. Skillman, Richard W. Pogge, Erik Aver +9

Extremely low metallicity HII regions have been observed with the goal of determining the primordial helium abundance ($Y_{\mathrm{p}}$). $Y_{\mathrm{p}}$, combined with standard big bang nu…