Galactic Cosmic Rays from Superbubbles and the Abundances of Lithium, Beryllium, and Boron

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.

25 pages, 9 figures. Accepted for publication in the Astrophysical Journal

References in corpus (4)

• Lithium abundances for 185 main-sequence stars - Galactic evolution and stellar depletion of lithium
• Galactic chemical abundance evolution in the solar neighborhood up to the Iron peak
• Oxygen in the Very Early Galaxy
• Inhomogeneous Big Bang Nucleosynthesis: Upper Limit on Omega_b and Production of Lithium, Beryllium, and Boron

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