Research Article Open Access

Gravity Assist and Scattering off AGB Stars off Molecular Clouds

Ahmad Hashem Abdelhadi


The 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 I 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. I model the dynamics by superposing on a standard axisymmetric galactic potential the discrete potentials of thousands of molecular clouds moving in constant circular orbits. Gravity assist occurs when a star scattered into a crossing orbit by one cloud experiences forward scattering from a second cloud.

American Journal of Applied Sciences
Volume 6 No. 4, 2009, 784-787


Submitted On: 6 August 2008 Published On: 30 April 2009

How to Cite: Abdelhadi, A. H. (2009). Gravity Assist and Scattering off AGB Stars off Molecular Clouds. American Journal of Applied Sciences, 6(4), 784-787.

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  • Silicon carbide
  • AGB stars
  • gravity assist