On the Primordial Helium Abundance and the DeltaY/DeltaO Ratio
classification
🌌 astro-ph
keywords
heliumabundancedeltaincreaseprimordialchemicalcomparedeltao
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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 Delta Y/Delta O, and compare them with predictions based on models of galactic chemical evolution.
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