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Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..11e..10a&link_type=abstract
Pre-Solar Grains as Astrophysical Tools, 26th meeting of the IAU, Joint Discussion 11, 21 August 2006, Prague, Czech Republic, J
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Scientific paper
With a few notable exceptions, there has been frustratingly little communication between meteoriticists and either astronomers or astrophysicists. Perhaps the best way to improve this in the future is to identify specific problems/questions that can best be addressed by a multidisciplinary approach. Some possibilities are listed below. Galactic Chemical Evolution - Does the spread in `primordial isotopic compositions' of presolar grains reflect heterogeneous or homogeneous chemical evolution, or some other process? Why is solar at the low metallicity end of the Si isotope distribution when it should be more evolved? Nucleosynthesis and stellar evolution - What is the process responsible for the onset and extent of cool bottom processing? How do J-type C stars form? Can we constrain the nature of neutron bust nucleosynthesis and N nucleosynthesis in supernovae? Condensation in stellar atmospheres, winds and ejecta -Neither nucleation or growth are very well understood. Was nucleation homogeneous or heterogeneous? Was growth near equilibrium or determined largely by kinetics? What are the size distributions of grains? Dust production and processing in the ISM - Determining primary dust production rates is an essential step to understanding dust evolution in the ISM, but astronomical estimates vary widely. Presolar grains can help constrain dust production rates, but we must understand how grains from so many different stars were accumulated in the presolar nebula, and why they do not show much evidence for processing in the ISM. Mysteries remain, such as why AGB `graphite' grains are so underabundant in meteorites. Processing in the Solar System - The presolar grains in meteorites and IDPs have all survived various nebular and parent body processes. How might this have distorted the presolar record and what can it tell us about the evolution of the early Solar System?
Alexander Clark
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