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Nitrogen Isotopes in Silicon Carbide: Stellar Nucleosynthesis?

Huss, G. R. and Nichols, R. H., Jr. and Wasserburg, G. J. (1995) Nitrogen Isotopes in Silicon Carbide: Stellar Nucleosynthesis? Meteoritics, 30 (5). p. 523. ISSN 0026-1114.

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Nitrogen in presolar SiC varies over a wide range of concentrations and is typically ^(14)N-rich relative to solar N, consistent with ^(15)N being consumed during CNO processing in stellar envelopes [e.g., 1]. Although C is also heavily processed in the envelopes [1], no clear isotopic correlation exists between C and N [e.g., 2], making N compositions difficult to interpret. Although the same general N features are seen in SiC from many meteorites, clear differences between meteorites have also been observed. In particular, Murchison SiC appears to have systematically higher ^(15)N/^(14)N ratios than Orgueil SiC [2,3]. Among ISN-poor SiC grains for both meteorites, ^(15)N/^(14)N and ^(28)Si/^(l4)N exhibit a positive correlation (Fig. 1).

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Huss, G. R.0000-0003-4281-7839
Wasserburg, G. J.0000-0002-7957-8029
Additional Information:© 1995 Meteoritical Society. Supported by NASA NAG-3040. Div. Contrib. #5560 (904).
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Caltech Division of Geological and Planetary Sciences5560
Lunatic Asylum Lab904
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Official Citation:Nitrogen Isotopes in SiC: Stellar Nucleosynthesis? Huss, G. R., Nichols, R. H., Jr., & Wasserburg, G. J. Meteoritics, vol. 30, no. 5, page 523
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43063
Deposited By: Ruth Sustaita
Deposited On:18 Dec 2013 21:19
Last Modified:09 Mar 2020 13:19

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