Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...19312214s&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #122.14; Bulletin of the American Astronomical Society, Vol. 31, p.666
Astronomy and Astrophysics
Astronomy
Scientific paper
The standard paradigm for the production of Be and B by cosmic-ray interactions on the ambient ISM has been questioned in recent years due to the accumulation of Be and B data in metal poor halo stars which suggest a linear relationship between log(Be/H) and [Fe/H] and log(B/H) and [Fe/H]. This indicates that a primary production mechanism is necessary for B and Be, particularly at lower ([Fe/H] < -1) metalicities. The collective acceleration by supernova shocks of ejecta-enriched material in superbubbles and the acceleration of the nucleosynthetic products of individual supernova have both been suggested as possibilities for such a mechanism. The latter model differs from the former in that it relies on all SNIIs not just those originating from massive (>60 Msun) progenitors and because it employs a cosmic-ray spectrum extending to relativistic energies, not just the low energies which avoid energetic problems. In order to explore these scenarios we developed a Monte-Carlo based chemical evolution for a simple one zone halo model which investigated Be, B and Fe production per supernova which could include the effects of the delay of the production of B and Be with respect to Fe and explore dependencies on the cosmic-ray composition. Closely tied to the production of Be and B is that of Li. While the majority of the 7Li at all galactic epochs did not originate from cosmic-ray interactions, it is likely that 6Li does. In addition, some of the B production, primarily 11B, is produced by neutrino spallation reactions in supernovae. We extend the simple Halo Monte-Carlo model into a two zone halo+disk model to explore the production of all of the isotopes of LiBeB through all of their various production mechanisms through a full time evolution to the present day.
Ramaty Reuven
Scully Sean Thomas
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