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Extreme ^(26)Mg and ^(17)O enrichments in an Orgueil corundum: Identification of a presolar oxide grain

Hutcheon, I. D. and Huss, G. R. and Fahey, A. J. and Wasserburg, G. J. (1994) Extreme ^(26)Mg and ^(17)O enrichments in an Orgueil corundum: Identification of a presolar oxide grain. Astrophysical Journal Letters, 425 (2). L97-L100. ISSN 2041-8205.

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A corundum (Al_2O_3) grain from the Orgueil meteorite is greatly enriched in ^(17)O and ^(26)Mg^*. The measured ^(16)O/^(17)O is 1028 ± 11 compared to ^(16)O/^(17)O)_☉ = 2610. This is the largest ^(17)O excess so far observed in any meteoritic material. The ^(26)Mg excess (^(26)Mg^*) is most plausibly due to in situ decay of ^(26)Al. The inferred ^(26)Al/^(27)Al)_0 ratio of 8.9 x 10^(-4) is ~ 18 times larger than the 5 x 10^(-5) value commonly observed in refractory inclusions formed m the solar system. The large ^(17)O excess and high ^(26)Mg^*/^(27)Al ratio unambiguously identify this corundum as a presolar oxide grain. Enrichments in ^(17)O and ^(26)Al are characteristic of H-burning and point to red giant or AGB stars as likely sources.

Item Type:Article
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Huss, G. R.0000-0003-4281-7839
Wasserburg, G. J.0000-0002-7957-8029
Additional Information:© 1994 American Astronomical Society. Received 1993 December 6; accepted 1994 February 2. We thank J. Stone for assistance in the initial phase of this study and D. D. Clayton for an insightful review. Supported by NASA grants NAGW-3040 and NAGW-3297. Div. Contrib. 5317(823).
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Subject Keywords:circumstellar matter; dust, extinction; nuclear reactions, nucleosynthesis, abundances; stars: AGB and post-AGB; solar system: formation
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Caltech Division of Geological and Planetary Sciences5317
Lunatic Asylum Lab823
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Official Citation:Extreme Mg-26 and O-17 enrichments in an Orgueil: Identification of a presolar oxide grain Hutcheon, I. D.; Huss, G. R.; Fahey, A. J.; Wasserburg, G. J. Astrophysical Journal Letters v.425, no.2 p.L97-L100
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43009
Deposited By: Ruth Sustaita
Deposited On:16 Dec 2013 16:04
Last Modified:09 Mar 2020 13:19

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