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Oxygen isotopes in circumstellar Al_2O_3 grains from meteorites and stellar nucleosynthesis

Huss, Gary R. and Fahey, Albert J. and Gallino, Roberto and Wasserburg, G. J. (1994) Oxygen isotopes in circumstellar Al_2O_3 grains from meteorites and stellar nucleosynthesis. Astrophysical Journal Letters, 430 (1). L81-L84. ISSN 2041-8205.

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We have found a ~3 µm Al_2O_3 grain (B39) in the Bishunpur LL3.1 chondrite that is enriched in ^(17)O by a factor of ~ 6.8 (^(16)O/^(17)O = 385 ± 9) and depleted in 180 by almost 60% (^(16)O/^(18)O = 853 ± 30) relative to solar system oxygen and has an initial ^(26)Al/^(27)Al = 1.7 ± 0.2 x 10^3, ~34 times greater than the initial solar system value. The isotopic compositions of B39 and two other Al_2O_3 grains previously reported from the Orgueil and Murchison meteorites show that these grains formed directly from the ejecta of low-mass AGB stars with C/0 < 1. A simple theoretical analysis is presented showing that the oxygen systematics of the grains are a natural consequence of main-sequence evolution followed by first dredge-up. ^(26)AI is the result of third dredge-up. Circumstellar Al_2O_3 grains provide very precise isotopic data for stellar ejecta that complement spectroscopic observations of oxygen-rich stars. Isotopic differences indicate that the Al_2O_3 grains come from separate stars of different mass and initial oxygen composition that originated in molecular clouds different from the one in which the solar system formed.

Item Type:Article
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URLURL TypeDescription
Huss, Gary R.0000-0003-4281-7839
Wasserburg, G. J.0000-0002-7957-8029
Additional Information:© 1994 American Astronomical Society. Received 1994 March 16; accepted 1994 April 29. We thank David Dearborn, Mounib El Eid, Daniel Schaerer, Michael Wischer, and Peter Wannier for useful discussions. The enthusiasm of I.-J. Sackmann and Arnold Boothroyd for these grains has been particularly rewarding. Work was supported by NASA grants NAGW-3040, NAGW- 3337 and NAGW-3297. This is Division Contribution 5389(847).
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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 Sciences5389
Lunatic Asylum Lab847
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Record Number:CaltechAUTHORS:20131217-112004671
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Official Citation:Oxygen isotopes in circumstellar Al_2O_3 grains from meteorites and stellar nucleosynthesis Huss, Gary R.; Fahey, Albert J.; Gallino, Roberto; Wasserburg, G. J. The Astrophysical Journal, Part 2 - Letters, vol. 430, no. 1, p. L81-L84 1994
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43045
Deposited By: Ruth Sustaita
Deposited On:17 Dec 2013 21:05
Last Modified:09 Mar 2020 13:19

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