Implications of a new temperature scale for halo dwarfs on LiBeB and chemical evolution
| dc.creator | Fields, Brian D. | |
| dc.creator | Olive, Keith A. | |
| dc.creator | Vangioni-Flam, Elisabeth | |
| dc.date | 2004-11-26 | |
| dc.date.accessioned | 2026-07-07T12:16:24Z | |
| dc.date.available | 2026-07-07T12:16:24Z | |
| dc.description | 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. | |
| dc.description | 23 pages, 10 eps figures | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0411728 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0411728 | |
| dc.identifier | Astrophys.J.623:1083-1091,2005 | |
| dc.identifier | doi:10.1086/429085 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/211788 | |
| dc.subject | Astrophysics | |
| dc.title | Implications of a new temperature scale for halo dwarfs on LiBeB and chemical evolution | |
| dc.type | text |