Bibcode
Casuso, E.; Beckman, J. E.
Referencia bibliográfica
Gravit. Cosmol., Vol. 5, suppl. issue, p. 82 - 86
Advertised on:
1999
Número de citas
0
Número de citas referidas
0
Descripción
This article presents a theoretical framework for the evolution of light
element nuclides in the Galactic disc. The authors use two key
assumptions: infall of metal-poor gas to the disc at an increasing rate,
and destruction of fragile nuclides in hot relatively dense supergiant
envelopes. Light nuclides are accelerated by supernova shocks, and many
are confined to hot interstellar zones by magnetic fields. Their
repeated passage through the hot envelopes causes depletion which peaked
during the star main forming phase of galaxy evolution around z ≍
1 (Hubble Deep Field). This mechanism reduced the D/H abundance from its
primordial value of ≅2×10-4 to its Solar System
value of ≅2.5×10-5, and subsequently more
gradually to the current ISM value of 1.5×10-5. The
model accounts well for Solar System and the current ratios of
7Li/6Li and 11B/10B. It fits
extremely well an SBBN model with baryon density ≅0.05.