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Published November 21, 2001 | Published
Book Section - Chapter Open

Constraints on the nucleosynthesis of refractory nuclides in galactic cosmic rays

Abstract

Abundances of the isotopes of the refractory elements Ca, Fe, Co, and Ni in the galactic cosmic-ray source are compared with corresponding abundances in solar-system matter. For the 12 nuclides considered, relative abundances agree to within a factor of 2, and typically within 20–30%. In addition, comparisons of cosmic-ray abundances with model calculations of supernova yields are used to argue that cosmic rays contain contributions from stars with a broad range of masses. Based on these and other results we suggest that cosmic rays probably represent a sample of contemporary interstellar matter, at least for refractory species.

Additional Information

© 2001 American Institute of Physics. Issue Date: 21 November 2001. This research was supported by the National Aeronautics and Space Administration at the California Institute of Technology (under grant NAG5-6912), the Jet Propulsion Laboratory, NASA's Goddard Space Flight Center, and Washington University.

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