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  • ASTROPHYSICS  (2)
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  • 1
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    Big bang photosynthesis and pregalactic nucleosynthesis of light elements (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Two nonstandard scenarios for pregalactic synthesis of the light elements (H-2, He-3, He-4, and Li-7) are developed. Big bang photosynthesis occurs if energetic photons, produced by the decay of massive neutrinos or gravitinos, partially photodisintegrate He-4 (formed in the standard hot big bang) to produce H-2 and He-3. In this case, primordial nucleosynthesis no longer constrains the baryon density of the universe, or the number of neutrino species. Alternatively, one may dispense partially or completely with the hot big bang and produce the light elements by bombardment of primordial gas, provided that He-4 is synthesized by a later generation of massive stars.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 293; L53-L57
    Format: text
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  • 2
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    CNO isotope production in nova outbursts (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A current model of novae is presented which explains their outbursts assuming that the progenitor of a common nova is a carbon-oxygen dwarf. This white dwarf accretes H-rich material from its companion which produces strong shock waves at its surface; as the amount of accreted material increases later, its bottom ignites. The nova outburst is then triggered by CNO-Ne reactions which favor the formation of rare isotopes with proton-rich radioactive parents such as C-13, N-15, O-17, and Ne-21. The production of such nuclear species is examined in different nova models, and conclusions are drawn concerning the importance of novae in models of chemical evolution of the galaxy.
    Keywords: ASTROPHYSICS
    Type: The elements and their isotopes in the universe; International Conference on Astrophysics; Jun 20, 1978 - Jun 22, 1978; Liege; Belgium
    Format: text
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    NASA TECHNICAL REPORTS
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