SIMBAD references

2005ApJ...623.1083F - Astrophys. J., 623, 1083-1091 (2005/April-3)

Implications of a new temperature scale for halo dwarfs on LiBeB and chemical evolution.

FIELDS B.D., OLIVE K.A. and VANGIONI-FLAM E.

Abstract (from CDS):

Big bang nucleosynthesis (BBN) and the cosmic baryon density from cosmic microwave background anisotropies together predict a primordial 7Li abundance a factor of 2-3 higher than that observed in galactic halo dwarf stars. A recent analysis of 7Li observations in halo stars, using significantly higher surface temperature for these stars, found a higher Li plateau abundance. These results go a long way toward resolving the discrepancy with BBN. Here we examine the implications of the higher surface temperatures on the abundances of Be and B that are thought to have been produced in galactic cosmic-ray nucleosynthesis by spallation of CNO together with Li (produced in α+α 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 pose a serious challenge to models of galactic cosmic-ray nucleosynthesis and galactic chemical evolution.

Abstract Copyright:

Journal keyword(s): ISM: Cosmic Rays - Cosmology: Early Universe - Nuclear Reactions, Nucleosynthesis, Abundances - Stars: Abundances

Simbad objects: 3

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2021.06.17-11:21:21

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