AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 28. Cosmic Rays, Supernova and Light Element Production
Special, Oral, Monday, May 31, 1999, 2:00-3:30pm, Grand Ballroom

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[28.05] The Origin of Present Day Cosmic Rays: Fresh SN Ejecta or Interstellar Medium Material?

D.C. Ellison (North Carolina State U.), J.-P. Meyer (Service d'Astrophysique, DAPNIA, CEA/Saclay, France), L.O'C. Drury (Dublin Inst. for Advanced Studies, Dublin, Ireland)

Assuming that cosmic ray refractory material originates in dust grains, we examine the viability of cosmic ray origin models wherein the bulk of present day cosmic rays are accelerated out of fresh supernova ejecta material before it mixes with the average interstellar medium. We conclude that the fresh ejecta scenarios that have been proposed thus far have serious flaws and are unable to account for known properties of present day cosmic rays. This implies that the near linear increase in Be abundance with metallicity observed in old, halo stars cannot imply that a significant fraction of the cosmic rays seen today come from fresh supernova ejecta.

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