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The Superbubble Model for LiBeB Production and Galactic Evolution

Published online by Cambridge University Press:  25 May 2016

Etienne Parizot  and
Luke Drury
Etienne Parizot
Affiliation:
Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin 2, Ireland
Luke Drury
Affiliation:
Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin 2, Ireland

Abstract

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We show that the available constraints relating to 6LiBeB 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 10−1Z⊙.

Type
2. Production and Destruction of the Elements
Information
Symposium - International Astronomical Union , Volume 198: The Light Elements and their Evolution , 2000 , pp. 35 - 40
Copyright
Copyright © Astronomical Society of the Pacific 2000 

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