AL-26 PRODUCTION IN AGB STARS AND 1809-MEV LINE EMISSION IN THE GALAXY

We describe the nucleosynthesis of Al-26 in hot-bottom burning convect ive envelopes of intermediate mass AGB stars. Using a schematic model of AGB star evolution, we calculate Al-26 yields for AGB stars of diff erent initial masses and metallicities, and these are employed in an e quilibrium chemical evolution model. The intensity of the 1.809 MeV li ne emission resulting from the residual Al-26 in the interstellar medi um is calculated as a function of longitude in the galactic plane. Emi ssivity distributions corresponding to observed distributions of AGB s tars and a star forming spiral galaxy describable by spiral density wa ve theory are considered.