The evolution of Be-9

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Abundance, Beryllium 9, Galactic Evolution, Interstellar Matter, Nuclear Fusion, Star Formation, Astronomical Models, Cosmic Rays, Milky Way Galaxy

Scientific paper

The history of Be-9 from the birth of the Galaxy to the present is followed using a dedicated Galactic evolutionary model and observational evidence. It is found that the sharp rise in the Be/H ratio is due to the rapid growth of the abundance of its progenitors C, N, and O in the interstellar medium due to intense stellar nucleosynthesis and ejection in the early Galaxy. Infall of extragalactic matter has only marginal importance in the behavior of Be-9, but it has kept the Be/H ratio constant over the last billion yr. Constraints which Be-9 sets on the formation rate of massive stars in the first epochs of galactic evolution are discussed.

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