Measurements of 4He in Metal-Poor Extragalactic HII Regions: the Primordial Helium Abundance and the Delta Y / Delta O Ratio

Details Measurements of 4He in Metal-Poor Extragalactic HII Regions: the Primordial Helium Abundance and the Delta Y / Delta O Ratio Measurements of 4He in Metal-Poor Extragalactic HII Regions: the Primordial Helium Abundance and the Delta Y / Delta O Ratio

2009-12-04

arxiv.org/abs/0912.0764v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

10 pages, 2 figures. To appear in Light elements in the Universe, Proceedings IAU Symposium No 268

Scientific paper

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 HII 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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