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Stellar He Production in a Cold Universe?

  • W. W. Ober
  • H. J. Falk
Conference paper
Part of the Astrophysics and Space Science Library book series (ASSL, volume 109)

Abstract

A hot Big-Bang model of the Universe is quite successful in explaining the observed Helium abundance together with the 2.7 K microwave background radiation. But one might think of other scenarios as well, for example the mass-energy conversion by nucleosynthesis in stars formed in a cold (no photons or particle pairs) Universe out of density fluctuations (Carr & Rees, 1977; Rees, 1978; White & Rees, 1978). Carr (1977) has discussed Helium production in such a Universe by cosmological nucleosynthesis and showed that Helium decreases as the lepton to baryon ratio (L/N) increases — above L/N > 1.5 no Helium is cosmologically produced at all. He concluded that the observed Helium abundance could only be produced if the ratio was in the range 1.20 < L/N < 1.23, but then an overproduction of heavier elements would be expected. Helium production in massive mass losing stars has been considered by Talbot and Arnett (1971) whose semi-analytic treatment gave a Helium nucleosynthetic yield as great as 0.5. However, Carr (1977) has questioned the certainty of their yields.

Keywords

Black Hole Heavy Element Initial Mass Function Stellar Nucleosynthesis Helium Production 
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

© D. Reidel Publishing Company 1984

Authors and Affiliations

  • W. W. Ober
    • 1
  • H. J. Falk
    • 1
  1. 1.Max-Planck-Institut für AstrophysikGarching b. MünchenFed. Rep. Germany

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