Computer Science
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.310..282p&link_type=abstract
Nature (ISSN 0028-0836), vol. 310, July 26, 1984, p. 282-285. Navy-supported research.
Computer Science
Binary Stars, Companion Stars, Particle Acceleration, Photonuclear Reactions, X Ray Sources, Cosmic Rays, Cygnus Constellation, Gamma Rays, Nuclear Interactions, Proton Energy
Scientific paper
The attenuation times of protons and heavier nuclei in the radiation fields of the stellar companions to the Cyg X-3 and Vela X-1 compact objects are calculated. The maximum observed gamma-ray energy permits an upper limit to be placed on the acceleration time scale of protons at 3 x 10 to the 16th eV of 10,000-300,000 s for Cyg X-3 and 100,000 for Vela X-1. This result can be used to put some constraints on the nature for the particle accelerator. If binary X-ray sources are contributing significantly to the cosmic rays, the cosmic ray abundances will be affected by photonuclear interactions.
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