Statistics – Computation
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...403...65m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 403, no. 1, p. 65-73.
Statistics
Computation
26
Abundance, Chemical Evolution, Galactic Evolution, Helium, Irregular Galaxies, Nuclear Astrophysics, Astronomical Models, Computational Astrophysics, H Ii Regions, Metallicity
Scientific paper
Several models for the origin and chemical evolution of compact irregular galaxies are studied in order to determine the primordial He-4 abundance, YP, from the zero metallicity intercept of the observed Y vs Z correlations. The suggestion that a straight-line fit to the observations does not necessarily give the correct primordial He-4 abundance. The best fits to the data yield Yp of 0.228 +/- 0.005 for O/H and Yp of 0.223 +/- 0.006 for N/H. These primordial helium abundances are as much as 2 sigma below the minimum helium abundance which can be produced in the standard homogeneous big bang model with three light neutrino flavors. This discrepancy may be due to shortcomings of the chemical evolution models, additional systematic errors in the determination of the helium and/or metal abundances in extragalactic H II regions, or effects of nonstandard primordial nucleosynthesis.
Boyd Richard N.
Fuller George M.
Mathews Grant J.
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