Anomalous Isotopic Abundances in Presolar Grains

Details Anomalous Isotopic Abundances in Presolar Grains Anomalous Isotopic Abundances in Presolar Grains

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aps..apr..n804c&link_type=abstract

American Physical Society, APS/AAPT Joint April Meeting, April 18-21, 1998 Columbus, Ohio, abstract #N8.04

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Presolar grains of refractory micrometer solids are extracted from the meteorites and are identified by their very peculiar isotopic abundance ratios(T. Bernatowicz and R. M. Walker, Physics Today, Dec. 1997, p. 26-32). These isotopes identify those grains as having grown from material from individual stars prior to the birth of the sun. The grains were incorporated into the forming solar system as interstellar dust particles. Their highly unusual isotopic ratios identify the types of stars in which they formed and open a new window on nucleosynthesis. For the first time the abundances from distinct nucleosynthesis processes can be viewed directly, without need for disentangling the solar system mixture. This talk reviews highlights of this new knowledge and new theoretical perspectives that it supports. One highlight is a new measure of the diffusion of stellar orbits in the old Milky Way(D. D. Clayton, Ap.J., 484, L67 (1997)); another is supernova grains made from nuclei that were only one year old at the time.

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