Superbubbles and the Galactic evolution of Li, Be and B
| dc.creator | Parizot, Etienne | |
| dc.date | 2000-06-07 | |
| dc.date.accessioned | 2026-07-07T01:53:53Z | |
| dc.date.available | 2026-07-07T01:53:53Z | |
| dc.description | From a recent re-analysis of the available data, Be and B Galactic evolution appears to show evidence for a two-slope behaviour with respect to O. The inferred Be/O abundance ratio in halo stars is constant at very low metallicity (primary behaviour) and increases proportionally to O/H at high metallicity (secondary behaviour). We show that this can be explained in the framework of one single model, the `superbubble model', in which Li, Be and B are produced by spallation reactions induced by energetic particles accelerated out of a mixture of supernova (SN) ejecta and ambient interstellar medium inside superbubbles (SBs). All the qualitative and quantitative constraints, including the energetics, the value of the transition metallicity and the 6Li/9Be isotopic ratio, are satisfied provided that the energetic particles have a spectrum flattened at low energy (in E^-1) and that the proportion of the SN ejecta inside SBs is of the order of a few percent. This lends support to Bykov's acceleration mechanism inside SBs and to the SB dynamical evolution model of Mac Low & McCray (1988). | |
| dc.description | 14 pages, 6 figures, A&A in press | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0006099 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0006099 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/1134 | |
| dc.subject | Astrophysics | |
| dc.title | Superbubbles and the Galactic evolution of Li, Be and B | |
| dc.type | text |