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Chemical Evolution of Galaxies

  • B. E. J. Pagel
Conference paper
Part of the Astrophysics and Space Science Library book series (ASSL, volume 169)

Abstract

Initial conditions are probably set by results of Big Bang nucleosynthesis (BBNS) without intervening com­plications affecting the composition of visible matter so that extrapolation of observed abundances to BBNS products seems fairly secure. Primordial helium and deuterium abundances deduced in this way place upper and lower limits on baryonic density implying that both baryonic and non-baryonic dark matter exist and predicting no more than 3 neutrino flavours as recently confirmed in accelerator experiments. The validity of simple galactic chemical evolution models assumed in extrapolating back to the Big Bang is examined in the light of the frequency distribution of iron or oxygen abundances in the Galactic halo, bulge and disk.

Keywords

Dark Matter Chemical Evolution Globular Cluster Star Formation Rate Galactic Halo 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media Dordrecht 1991

Authors and Affiliations

  • B. E. J. Pagel
    • 1
  1. 1.NORDITACopenhagen ∅Denmark

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