Primordial and non-primordial helium

Details Primordial and non-primordial helium Primordial and non-primordial helium

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phr...227..251p&link_type=abstract

Physics Reports, Volume 227, Issue 1-5, p. 251-256.

Physics

2

Scientific paper

Existing data on helium, oxygen and nitrogen abundances in HII, blue compact and irregular galaxies are rediscussed paying special attention to objects with noticeable broad emission lines due to Wolf-Rayet stars, in some of which there is reason to suspect temporary and local enhancements of both helium and nitrogen from stellar winds. The resulting estimate of the primordial helium abundance, YP = 0.228 +/- 0.005 (s.e.), is unchanged from what has been derived previously, but the dY/dZ slope is still remarkably large, about 4, and in significant disagreement with what had been theoretically predicted for these low-metallicity systems.

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