He and Ne ages of large presolar silicon carbide grains: Solving the recoil problem

Ulrich Ott, Philipp R. Heck, Frank Gyngard, Rainer Wieler, Frédéric Wrobel, Sachiko Amari, Ernst Zinner

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Knowledge about the age of presolar grains provides important insights into Galactic chemical evolution and the dynamics of grain formation and destruction processes in the Galaxy. Determination from the abundance of cosmic ray interaction products is straightforward, but in the past has suffered from uncertainties in correcting for recoil losses of spallation products. The problem is less serious in a class of large (tens of m) grains. We describe the correction procedure and summarise results for He and Ne ages of presolar SiC 'Jumbo' grains that range from close to zero to ∼850 Myr, with the majority being less than 200 Myr. We also discuss the possibility of extending our approach to the majority of smaller SiC grains and explore possible contributions from trapping of cosmic rays.

Original languageEnglish
Pages (from-to)297-302
Number of pages6
JournalPublications of the Astronomical Society of Australia
Volume26
Issue number3
DOIs
Publication statusPublished - Oct 5 2009

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Keywords

  • Circumstellar matter
  • Cosmic rays
  • ISM: kinematic and dynamics
  • Stars: AGB

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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