Extinct Technetium in Silicon Carbide Stardust Grains: Implications for Stellar Nucleosynthesis

Details Extinct Technetium in Silicon Carbide Stardust Grains: Implications for Stellar Nucleosynthesis Extinct Technetium in Silicon Carbide Stardust Grains: Implications for Stellar Nucleosynthesis

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sci...303..649s&link_type=abstract

Science, Volume 303, Issue 5658, pp. 649-652 (2004).

Computer Science

30

Scientific paper

The isotopic composition of ruthenium (Ru) in individual presolar silicon carbide (SiC) stardust grains bears the signature of s-process nucleosynthesis in asymptotic giant branch stars, plus an anomaly in 99Ru that is explained by the in situ decay of technetium isotope 99Tc in the grains. This finding, coupled with the observation of Tc spectral lines in certain stars, shows that the majority of presolar SiC grains come from low-mass asymptotic giant branch stars, and that the amount of 99Tc produced in such stars is insufficient to have left a detectable 99Ru anomaly in early solar system materials.

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