The superbubble model for Li, Be and B production and Galactic evolution

Details The superbubble model for Li, Be and B production and Galactic evolution The superbubble model for Li, Be and B production and Galactic evolution

2000-02-09

arxiv.org/abs/astro-ph/0002208v1

Astronomy and Astrophysics

Astrophysics

6 pages, 4fig., Proc. of the IAU Symposium 198 "The Light Elements and Their Evolution", eds. L. da Silva, M. Spite, J.R. de M

Scientific paper

We show that the available constraints relating to $^{6}$LiBeB Galactic evolution can be accounted for by the so-called superbubble model, according to which particles are efficiently accelerated inside superbubbles out of a mixture of supernova ejecta and ambient interstellar medium. The corresponding energy spectrum is required to be flat at low energy (in E^-1 below 500 MeV/n, say), as expected from Bykov's acceleration mechanism. The only free parameter is also found to have the value expected from standard SB dynamical evolution models. Our model predicts a slope 1 (primary) and a slope 2 (secondary) behaviour at respectively low and high metallicity, with all intermediate slopes achieved in the transition region, between 10^-2 and 10^-1 Z_sol.

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