Seven problems related to the determination of the primordial helium abundance

Details Seven problems related to the determination of the primordial helium abundance Seven problems related to the determination of the primordial helium abundance

2002-11-22

arxiv.org/abs/astro-ph/0211497v1

Astronomy and Astrophysics

Astrophysics

10 pages. Conference on Star Formation through Time (ASP Conference Series)

Scientific paper

Recent advances on the quest to determine the primordial or pregalactic helium abundance, Yp, are reviewed. There are seven problems affecting the He/H abundance determinations of H II regions that are briefly discussed: the underlying absorption lines in the observed spectra, the ionization, temperature, and density structures of each object, the collisional contribution to the intensity of the He I and H I lines, the optical thickness of the He I lines, and the extrapolation to derive Yp based on the Y and O/H values.

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