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He and Ne Ages of Large Presolar Silicon Carbide Grains: Solving the Recoil Problem

Published online by Cambridge University Press:  05 March 2013

Ulrich Ott ,
Philipp R. Heck ,
Frank Gyngard ,
Rainer Wieler ,
Frédéric Wrobel ,
Sachiko Amari  and
Ernst Zinner
Ulrich Ott*
Affiliation:
Max-Planck-Institute for Chemistry, Joh.-J.-Becher-Weg 27, D-55128 Mainz, Germany
Philipp R. Heck
Affiliation:
Institute of Isotope Geology and Mineral Resources, ETH Zürich, CH-8092 Zürich, Switzerland Chicago Center for Cosmochemistry, Department of the Geophysical Sciences, The University of Chicago, Chicago, IL, USA
Frank Gyngard
Affiliation:
Laboratory for Space Sciences and the Physics Department, Washington University, St. Louis, MO 63130, USA
Rainer Wieler
Affiliation:
Institute of Isotope Geology and Mineral Resources, ETH Zürich, CH-8092 Zürich, Switzerland
Frédéric Wrobel
Affiliation:
Institut d'Electronique du Sud, Université de Montpellier 2, F-34095 Montpellier, France
Sachiko Amari
Affiliation:
Laboratory for Space Sciences and the Physics Department, Washington University, St. Louis, MO 63130, USA
Ernst Zinner
Affiliation:
Laboratory for Space Sciences and the Physics Department, Washington University, St. Louis, MO 63130, USA
*
FCorresponding author. Email: [email protected]
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Abstract

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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 μm) 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.

Keywords

circumstellar matterstars: AGBISM: kinematic and dynamicscosmic rays
Type
Grains
Information
Publications of the Astronomical Society of Australia , Volume 26 , Issue 3 , 2009 , pp. 297 - 302
Copyright
Copyright © Astronomical Society of Australia 2009

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