Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.207..153k&link_type=abstract
In ESA Plasma Astrophys. p 153-157 (SEE N85-22270 12-90)
Astronomy and Astrophysics
Astrophysics
Abundance, Chemical Composition, Cosmic Rays, Antiprotons, Interstellar Chemistry, Particle Acceleration, Wolf-Rayet Stars
Scientific paper
Cosmic ray (CR) elemental and isotopic compositions are discussed. Elemental composition at the sources is similar to a local galactic composition modified by a first ionization potential dependent bias. While H and He are underabundant in CR source compositions, C and Z 60 elements are probably overabundant. Some isotopic ratios are different in CR source and local group composition, the most important discrepancy being the high 22Ne/20Ne ratio. Overabundance of C and most anomalous isotopic ratios can be explained by a 2% to 3% contribution of Wolf-Rayet stars to the primary CR particles, and by a metallicity gradient in the galaxy. The interstellar matter penetrated by cosmic rays decreases with increasing rigidity, at least up to 100 GeV/nucleon. The calculated source spectra of abundant nuclei are consistent with power spectra in momentum from 5 to 100 GeV/nucleon.
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