Physics
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003phdt.........1a&link_type=abstract
Thesis (PhD). CLEMSON UNIVERSITY, Source DAI-B 64/07, p. 3323, Jan 2004, 77 pages.
Physics
Scientific paper
Scattering of stellar orbits by galactic molecular clouds is studied in hope of explaining isotopic peculiarities of presolar grains from Asymptotic Giant Branch (AGB) stars. Silicon isotopic anomalies found in the mainstream silicon carbide (SiC) grains are observed to have heavy isotopes enriched. To explain the isotopic heaviness we propose that AGB stars that formed in the interior region of the galaxy, with metallicity higher than solar, change their orbits during close encounters with molecular clouds. The AGB stars give up their SiC grains in winds deposited in the solar neighborhood prior to the birth of the sun. We model the dynamics by superposing on a standard axisymmetric galactic potential the discrete potentials of thousands of molecular clouds moving on constant circular orbits. Their initial positions were randomly distributed within a molecular-cloud ring. Gravity assist occurs when a star scattered into a crossing orbit by one cloud experiences forward scattering from a second cloud. We record their positions at different points in time throughout the AGB lifetime.
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