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Paper: On the Primordial Helium Abundance and the ΔYO Ratio
Volume: 374, From Stars to Galaxies: Building the Pieces to Build Up the Universe
Page: 81
Authors: Peimbert, M.; Luridiana, V.; Peimbert, A.; Carigi, L.
Abstract: We present a review on the determination of the primordial helium abundance, Yp, based on the study of hydrogen and helium recombination lines in extragalactic H ii regions. We also discuss the observational determinations of the increase of helium to the increase of oxygen by mass ΔYO, and compare them with predictions based on models of galactic chemical evolution.
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