Other
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980stin...8033335w&link_type=abstract
Presented at the Astrophys. Workshop, Santa Cruz, Calif., 7-18 Jul. 1980
Other
Cosmic Rays, Isotopes, Radiation Sources, Stellar Radiation, Giant Stars, Interstellar Chemistry, Magnesium Isotopes, Neon Isotopes, Nuclear Fusion, Planetary Nebulae, Supernova Remnants, Supernovae
Scientific paper
Measurements of nonsolar isotopic patterns for the elements neon and (perhaps) magnesium in cosmic rays are interpreted within current models of stellar nucleosynthesis. One possible explanation is that the stars currently responsible for cosmic ray synthesis in the Galaxy are typically super-metal-rich by a factor of two or three. Other possibilities include the selective acceleration of certain zones or masses of supernovas or the enhancement of (22)Ne in the stellar medium by mass loss from red giant stars and planetary nebulas. Measurements of critical isotopic ratios are suggested to aid in distinguishing among the various possibilities. Some of these explanations place significant constraints on the fraction of cosmic ray nuclei that must be fresh supernova debris and the masses of the supernovas involved.
Weaver Thomas A.
Woosley Stan E.
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