LiBeB Evolution: Three Models
| dc.creator | Ramaty, R. | |
| dc.creator | Lingenfelter, R. E. | |
| dc.creator | Kozlovsky, B. | |
| dc.date | 2000-01-26 | |
| dc.date.accessioned | 2026-07-07T01:51:54Z | |
| dc.date.available | 2026-07-07T01:51:54Z | |
| dc.description | We consider the three principal LiBeB evolutionary models, CRI in which the cosmic-ray source at all epochs of Galactic evolution is the average ISM, CRI+LECR in which metal enriched low energy cosmic rays (LECRs) are superimposed onto the CRI cosmic rays, and CRS in which the cosmic-ray source, accelerated in superbubbles, is constant, independent of the ISM metallicity. By considering the evolutionary trend of log(Be/H) vs. both [Fe/H] and [O/H], we demonstrate that the CRI model is energetically untenable. We present evolutionary trends for B-11/B-10 and B/Be which, combined with future precision measurements, could distinguish between the CRS and CRI+LECR models. We show that delayed LiBeB synthesis in the CRS model, due to the transport of the cosmic rays, could explain why log(Be/H) is steeper vs. [O/H] than vs. [Fe/H]. We also show that delayed deposition of Fe into star forming regions, due to its incorporation into high velocity dust, could provide an explanation for the possible rise of [O/Fe] with decreasing [Fe/H]. Observations of refractory and volatile alpha-elements could test this scenario. There seems to be a need for pregalactic or extragalactic Li-6 sources. | |
| dc.description | latex 10 pages, 7 double panel figures, uses newpasp.sty To appear in The Light Elements and Their Evolution, IAU Symp. 198, L. da Silva, M. Spite and R. de Medeiros, eds., ASP | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0001466 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0001466 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/452 | |
| dc.subject | Astrophysics | |
| dc.title | LiBeB Evolution: Three Models | |
| dc.type | text |