Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..11e...2n&link_type=abstract
Pre-Solar Grains as Astrophysical Tools, 26th meeting of the IAU, Joint Discussion 11, 21 August 2006, Prague, Czech Republic, J
Astronomy and Astrophysics
Astrophysics
Scientific paper
Presolar grains represent a sample of solid materials produced by a large number of different types of stars, probably within a few hundred million years just prior to the formation of the Sun. Because of the widely different evolutionary timescales for stars of different mass, the grains sample stars that formed throughout galactic history. Their chemical compositions, mineralogy, and isotopic compositions reflect a complex interplay of galactic chemical evolution, stellar nucleosynthesis and mixing, as well as physical and chemical conditions of circumstellar dust condensation. This talk will review the many ways that presolar grains are providing complementary data to astronomical abundance studies for understanding the history of our Galaxy, focusing on three areas: 1) Constraints on how isotopic ratios evolve with metallicity, with implications for nucleosynthesis sites of different elements and the relative abundances of different stellar inputs to the Galaxy (e.g. the supernova II/Ia ratio). 2) Constraints on the degree of mixing of material from diverse stars in the interstellar medium. 3) Constraints on the relative types of minerals produced by stars of different metallicity. Extensive examples from stellar, interstellar and presolar grain observations will be provided.
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