Primordial Helium Abundance Determinations

Details Primordial Helium Abundance Determinations Primordial Helium Abundance Determinations

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001rmxac..10..148p&link_type=abstract

The Seventh Texas-Mexico Conference on Astrophysics: Flows, Blows and Glows (Eds. William H. Lee and Silvia Torres-Peimbert) Rev

Astronomy and Astrophysics

Astrophysics

8

Galaxies: Abundances, Galaxies: Ism, H Ii Regions, Ism: Abundances

Scientific paper

Based on the best observations of extragalactic H II regions of low metallicity available in the literature we redetermine the primordial helium abundance, Y[p], taking into account all the observed He I line intensities with the exception of those strongly affected by underlying absorption. We derive He/H, N[e](He II), T[e](He II), and τ (3889) self-consistently. We present results for NGC 346, I Zw 18, and NGC 2363. From these objects we find that Y[p] = 0.2351+/-0.0022.

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