Galactic Cosmic Rays from Superbubbles and the Abundances of Lithium, Beryllium, and Boron
- 20 May 2002
- journal article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 571 (1) , 326-333
- https://doi.org/10.1086/339937
Abstract
In this article we study the galactic evolution of the LiBeB elements within the framework of a detailed model of the chemical evolution of the Galaxy that includes galactic cosmic ray nucleosynthesis by particles accelerated in superbubbles. The chemical composition of the superbubble consists of varying proportions of ISM and freshly supernova synthesized material. The observational trends of 6 LiBeB evolution are nicely reproduced by models in which GCR come from a mixture of 25% of supernova material with 75% of ISM, except for 6 Li, for which maybe an extra source is required at low metallicities. To account for 7 Li evolution several additional sources have been considered (neutrino-induced nucleosynthesis, nova outbursts, C-stars). The model fulfills the energetic requirements for GCR acceleration.Comment: 25 pages, 9 figures. Accepted for publication in the Astrophysical JournaKeywords
All Related Versions
This publication has 49 references indexed in Scilit:
- Galactic chemical abundance evolution in the solar neighborhood up to the iron peakAstronomy & Astrophysics, 2001
- Production of Lithium in the Galactic DiskPublications of the Astronomical Society of the Pacific, 2000
- The Revised COMPTEL Orion ResultsThe Astrophysical Journal, 1999
- LiBeB, Cosmic Rays, and Gamma‐Ray Line AstronomyPublications of the Astronomical Society of the Pacific, 1999
- Beryllium Abundances in Halo Stars from Keck/HIRES ObservationsThe Astronomical Journal, 1999
- Oxygen in Unevolved Metal-Poor Stars from Keck Ultraviolet HIRES SpectraThe Astronomical Journal, 1999
- 12C/13C ratios and Li abundances in C stars: evidence for deep mixing?Monthly Notices of the Royal Astronomical Society, 1997
- The primordial lithium abundanceMonthly Notices of the Royal Astronomical Society, 1997
- Oxygen abundances in unevolved metal-poor stars - Interpretation and consequencesThe Astrophysical Journal, 1989
- Carbon and nitrogen abundances in metal-poor dwarfs of the solar neighborhoodPublications of the Astronomical Society of the Pacific, 1987