Extinct Technetium in Silicon Carbide Stardust Grains: Implications for Stellar Nucleosynthesis-Reference-Cited by-同舟云学术

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

Published:2004-01-30 Issue:5658 Volume:303 Page:649-652
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Savina Michael R.¹²³⁴⁵,Davis Andrew M.¹²³⁴⁵,Tripa C. Emil¹²³⁴⁵,Pellin Michael J.¹²³⁴⁵,Gallino Roberto¹²³⁴⁵,Lewis Roy S.¹²³⁴⁵,Amari Sachiko¹²³⁴⁵

Affiliation:

1. Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, USA.

2. Enrico Fermi Institute, University of Chicago, Chicago, IL 60637, USA.

3. Department of the Geophysical Sciences, University of Chicago, Chicago, IL 60637, USA.

4. Dipartimento di Fisica Generale, Università di Torino and Sezione INFN di Torino, I-10125 Torino, Italy.

5. Laboratory for Space Sciences and Department of Physics, Washington University, St. Louis, MO 63130, USA.

Abstract

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 99 Ru that is explained by the in situ decay of technetium isotope 99 Tc 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 99 Tc produced in such stars is insufficient to have left a detectable 99 Ru anomaly in early solar system materials.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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