Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...380l...1o&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 380, Oct. 10, 1991, p. L1-L4. Research supported by Max-Planck-In
Astronomy and Astrophysics
Astrophysics
38
Abundance, Astronomical Models, Big Bang Cosmology, Helium, Nuclear Astrophysics, Evolution (Development), H Ii Regions, Nebulae, Nuclear Fusion
Scientific paper
Consistency of the primordial abundance of He-4 with the predictions of big bang nucleosynthesis provides a key test of the standard model of cosmology. Recent calculations predict that the primordial mass fraction of He-4, Yp, should exceed 0.236. The helium abundances determined from the observations of 38 metal-poor extragalactic H II regions are used to infer a 95 percent CL statistical upper bound to Yp which, depending on the specific method employed to extrapolate the data, and/or the subsets of data used in 1, 2, 3, or 4 parameter fits, yields Yp less than or equal to 0.237-0.243.
Olive Keith A.
Steigman Gary
Walker Terry P.
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