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Presolar Graphite: Noble Gases and their Origins

Published online by Cambridge University Press:  05 March 2013

Sachiko Amari
Sachiko Amari*
Affiliation:
Laboratory for Space Sciences and the Physics Department, Washington University, One Brookings Dr., St. Louis, MO 63130, USAsa@wuphys.wustl.edu
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Abstract

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Presolar graphite contains a 22Ne-rich component called Ne-E(L). Noble gas studies on graphite aggregates and single grains have shown that although a dominant source of the 22Ne is 22Na, 22Ne in the He-shell of asymptotic giant branch stars have also contributed to the Ne-E(L). In addition to novae that have been considered to be a possible source of 22Na, supernovae are a likely source as well. Krypton isotopic ratios of the separates indicate that part of graphite formed in low-mass (≤3 M⊙) asymptotic giant branch stars of low metallicity (Z ≤ 0.006).

Keywords

meteoritespresolar grainsNe-E(L)isotopic anomaliesnucleosynthesis
Type
Sixth Torino Workshop
Information
Publications of the Astronomical Society of Australia , Volume 20 , Issue 4 , 2003 , pp. 378 - 381
Copyright
Copyright © Astronomical Society of Australia 2003

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