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LiBeB Evolution: Three Models

Published online by Cambridge University Press:  25 May 2016

Reuven Ramaty ,
Richard E. Lingenfelter  and
Benzion Kozlovsky
Reuven Ramaty
Affiliation:
NASA/GSFC, Greenbelt, MD 20771, USA
Richard E. Lingenfelter
Affiliation:
CASS/UCSD, LaJolla, CA 92093, USA
Benzion Kozlovsky
Affiliation:
Tel Aviv University, Israel

Abstract

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We consider the three principal LiBeB evolutionary models, CRI in which the cosmic-ray source at all epochs of Galactic evolution is the average ISM, CRI+LECR in which metal enriched low energy cosmic rays (LECRs) are superimposed onto the CRI cosmic rays, and CRS in which the cosmic-ray source, accelerated in superbubbles, is constant, independent of the ISM metallicity. By considering the evolutionary trend of log(Be/H) vs. both [Fe/H] and [O/H], we demonstrate that the CRI model is energetically untenable. We present evolutionary trends for 11B/10B and B/Be which, combined with future precision measurements, could distinguish between the CRS and CRI+LECR models. We show that delayed LiBeB synthesis in the CRS model, due to the transport of the cosmic rays, could explain why log(Be/H) is steeper vs. [O/H] than vs. [Fe/H]. We also show that delayed deposition of Fe into star forming regions, due to its incorporation into high velocity dust, could provide an explanation for the possible rise of [O/Fe] with decreasing [Fe/H]. Observations of refractory and volatile α-elements could test this scenario. There seems to be a need for pregalactic or extragalactic 6Li sources.

Type
2. Production and Destruction of the Elements
Information
Symposium - International Astronomical Union , Volume 198: The Light Elements and their Evolution , 2000 , pp. 51 - 60
Copyright
Copyright © Astronomical Society of the Pacific 2000 

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