Astronomy and Astrophysics – Astrophysics
Scientific paper
1993-08-20
Astrophys.J.430:291-299,1994
Astronomy and Astrophysics
Astrophysics
18 pages; Plain TeX; UMN-TH-1131/93
Scientific paper
10.1086/174403
We investigate the possibility that inhomogeneous nucleosynthesis may eventually be used to explain the abundances of \li6, \be9 and B in population II stars. The present work differs from previous studies in that we have used a more extensive reaction network. It is demonstrated that in the simplest scenario the abundances of the light elements with $A\le7$ constrain the separation of inhomogeneities to sufficiently small scales that the model is indistinguishable from homogeneous nucleosynthesis and that the abundances of \li6, \be9\ and B are then below observations by several orders of magnitude. This conclusion does not depend on the \li7 constraint. We also examine alternative scenarios which involve a post-nucleosynthesis reprocessing of the light elements to reproduce the observed abundances of Li and B, while allowing for a somewhat higher baryon density (still well below the cosmological critical density). Future B/H measurements may be able to exclude even this exotic scenario and further restrict primordial nucleosynthesis to approach the homogeneous model conclusions.
Fields Brian D.
Mathews Grant J.
Meyer Bradley S.
Olive Keith A.
Schramm David N.
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