Zr and Mo isotopic constraints on the origins of unusual types of presolar SiC grains.

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Although most presolar silicon carbide grains form in asymptotic giant branch red giant stars (the so-called mainstream grains) or supernovae (the X-grains), there are a number of other minor types of grains whose origin is less clear. The dominant mechanisms of heavy element nucleosynthesis, the s-process and r-process, are thought to occur mainly in AGB stars and supernovae, respectively [1], and the isotopic patterns in heavy elements in presolar grains can be used to constrain their origins. We have previously reported that mainstream SiC grains have strong enrichments in the s-process isotopes of Sr, Zr and Mo [2-5] and that ... continued below

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5 p.

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Pellin, M. J.; Davis, A. M.; Calaway, W. F.; Lewis, R. S.; Clayton, R. N. & Amari, S. March 1, 2000.

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Although most presolar silicon carbide grains form in asymptotic giant branch red giant stars (the so-called mainstream grains) or supernovae (the X-grains), there are a number of other minor types of grains whose origin is less clear. The dominant mechanisms of heavy element nucleosynthesis, the s-process and r-process, are thought to occur mainly in AGB stars and supernovae, respectively [1], and the isotopic patterns in heavy elements in presolar grains can be used to constrain their origins. We have previously reported that mainstream SiC grains have strong enrichments in the s-process isotopes of Sr, Zr and Mo [2-5] and that X-grains have an unusual Mo isotopic composition that differs from s- and r-process expectations [6,7]. We report here the first measurements of Zr and Mo isotopes in several grains of other rare types that were found in the same mount as the mainstream and X-grains reported previously.

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5 p.

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OSTI as DE00768571

Medium: P; Size: 5 pages

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  • 31st Lunar and Planetary Science Conference, Houston, TX (US), 03/13/2000--03/17/2000

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  • Report No.: ANL/CHM/CP-101227
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 768571
  • Archival Resource Key: ark:/67531/metadc723356

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  • March 1, 2000

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  • Sept. 29, 2015, 5:31 a.m.

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  • April 11, 2017, 12:43 p.m.

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Pellin, M. J.; Davis, A. M.; Calaway, W. F.; Lewis, R. S.; Clayton, R. N. & Amari, S. Zr and Mo isotopic constraints on the origins of unusual types of presolar SiC grains., article, March 1, 2000; Illinois. (digital.library.unt.edu/ark:/67531/metadc723356/: accessed August 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.