Isotopic anomalies in cosmic rays and the metallicity gradient in the Galaxy

Details Isotopic anomalies in cosmic rays and the metallicity gradient in the Galaxy Isotopic anomalies in cosmic rays and the metallicity gradient in the Galaxy

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...278..406m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 278, no. 2, p. 406-414

Astronomy and Astrophysics

Astrophysics

28

Anomalies, Galactic Cosmic Rays, Interstellar Matter, Isotopes, Metallicity, Stellar Models, Stellar Winds, Wolf-Rayet Stars, Chemical Composition, Nuclear Fusion, Opacity, Space Density

Scientific paper

We suggest that the so called isotopic anomalies present in galacitc cosmic ray sources (GCRS) result from the fact that the local galactic medium is compared to accelerated matter originating mainly from inner galactic regions. In these inner regions, the matter injected into galactic cosmic rays (GCR) and interstellar medium is synthesized in stars with a higher initial metallicity and showing a higher relative frequency of Wolf-Rayet stars. A model taking into account the contributions of Wolf-Rayet stars to the isotopic anomalies of the GCRS and including the effects of the galactic metallicity gradient is presented. We take advantage of recent Wolf-Rayet models computed with up to date physical ingredients, as well as of recent determinations of the isotopic anomalies in the galactic cosmic rays sources, to show that this model accounts very well for the observed isotopic anomalies. We deduce from this model that: (1) On the average, in the solar neighborhood, five particles over 100 originate from Wolf-Rayet stars. This fraction should increase towards the galactic interior. (2) The bulk of galactic cosmic rays received at the earth is mainly a probe of material originating from a distance of 2.5-3.0 kpc towards the galactic interior.

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