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Cosmological Signatures in High S:N Spectra

Published online by Cambridge University Press:  19 July 2016

J. E. Beckman  and
B. E. J. Pagel
J. E. Beckman
Affiliation:
Instituto de Astrofisica de Canarias, 38200-La Laguna, Tenerife, Spain.
B. E. J. Pagel
Affiliation:
Royal Greenwich Observatory, Herstmonceux Castle, Hailsham, East Sussex BN27 1RP, United Kingdom.

Abstract

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We review briefly the observational status of abundance determinations for those elements produced in the first seconds of a “standard” Big Bang Universe, showing that although [4He] and [D] appear not to be mutually compatible there is still room for reconciliation via astration of D, for values consistent with estimated [7Li]. New limits to production cross-sections for 7Li appear to limit Nv (the number of light neutrino types) to no more than 3. Non-standard models with fluctuations are briefly considered; they are attractive because they use Ω = 1 and may also yield early C, N, O in significant quantities. The true value of 7Li [10-9 or 10−10 w.r.t. H] is the critical test here. We show where spectra of improved S:N are needed to progress in constraining cosmological models.

Type
VII. Abundance Constraints on Stellar Evolution, Nucleosynthesis, and Cosmological Theories
Information
Symposium - International Astronomical Union , Volume 132: The Impact of Veryhigh S/N Spectroscopy on Stellar Physics , 1988 , pp. 597 - 601
Copyright
Copyright © Kluwer 1988 

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