On the primordial helium abundance and spectroscopic uncertainties.

Details On the primordial helium abundance and spectroscopic uncertainties. On the primordial helium abundance and spectroscopic uncertainties.

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999phr...311..151p&link_type=abstract

Physics Reports, Vol. 311, No. 3 - 5, p. 151 - 161

Physics

Cosmology: Helium, Stellar Atmospheres: Helium

Scientific paper

To assess the uncertainties in primordial helium abundance determination by nebular codes, the authors calculate a grid of OB stellar atmospheres at low metallicities, including both non-local thermodynamic equilibrium (NLTE) and metal line blanketing effects. The more sophisticated stellar atmosphere models one uses can differ from LTE models by as much as 40% in the ratio of He to H-ionizing photons.

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