Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-11-26
Astrophys.J.623:1083-1091,2005
Astronomy and Astrophysics
Astrophysics
23 pages, 10 eps figures
Scientific paper
10.1086/429085
Big bang nucleosynthesis (BBN) and the cosmic baryon density from cosmic microwave background anisotropies together predict a primordial Li7 abundance a factor of 2--3 higher than that observed in galactic halo dwarf stars. A recent analysis of Li7 observations in halo stars, using significantly higher surface temperature for these stars, found a higher Li plateau abundance. These results go a long way towards resolving the discrepancy with BBN. Here, we examine the implications of the higher surface temperatures on the abundances of Be and B which are thought to have been produced in galactic cosmic-ray nucleosynthesis by spallation of CNO together with Li (produced in alpha + alpha collisions). While the Be abundance is not overly sensitive to the surface temperature, the derived B abundances and more importantly the derived oxygen abundances are very temperature dependent. If the new temperature scale is correct, the implied increased abundances of these elements poses a serious challenge to models of galactic cosmic ray nucleosynthesis and galactic chemical evolution.
Fields Brian D.
Olive Keith A.
Vangioni-Flam Elisabeth
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