Cosmological and Chemical Evolution Implications of New {(3He}) Abundances

Details Cosmological and Chemical Evolution Implications of New {(3He}) Abundances Cosmological and Chemical Evolution Implications of New {(3He}) Abundances

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...18311504r&link_type=abstract

American Astronomical Society, 183rd AAS Meeting, #115.04; Bulletin of the American Astronomical Society, Vol. 25, p.1465

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Bania et al. and Balser et al. at this meeting report abundances of {(3He}) ranging from {(3He/H}) ~ 1 -- 4 times 10(-5) . Here we consider the consequences of those abundances for the chemical evolution of the Galaxy and for cosmological nucleosynthesis. Since the abundance pattern does not fit the pattern expected from the overall chemical enrichment of the Galaxy, we suggest local enrichment of some H II regions perhaps from Wolf-Rayet winds. If averaged over an initial mass function stars are not a net sink for {(3He}) , then the abundance of our lowest abundance source places a lower limit on the cosmological parameter eta , the baryon to photon ratio. The lower limit from {(3He}) is about the same as the upper limit from {(2H}) , {(4He}) and {(7Li}) and resulting in a narrow band of acceptable eta ~ 4 times 10(-5) .

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