26AL Production in AGB Stars and 1.809 MeV Line Emission in the Galaxy

Astronomy and Astrophysics – Astronomy

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RESUMEN Describimos la nucleosintesis de 26Al en las envolventes convectivas con fondo caliente en cornbusti6n de las estrellas de la RGA de masa intermedia. Usando un modelo esquematico de la evoluci6n de las estrellas, calculamos los rendimientos de 26Al para estrellas de la RGA de diferentes masas iniciales y metalicidades, y estos se emplean en un modelo de evoluci6n quimica en equilibrio. Se calcula la intensidad de la emisi6n en la linea de 1.809 MeV resultante del 26Al residual en el medio interestelar como funci6n de longitud en el plano galactico. Se consideran las distribuciones de emisividad correspondientes a las distribuciones observadas de estrellas de la RGA y a una galaxia espiral con formaci6n estelar descrita por la teoria de ondas de densidad espiral. ABSTRACT We describe the nucleosynthesis of 26Al in hot-bottom burning convective envelopes of intermediate mass AGB stars. Using a schematic model of AGB star evolution, we calculate 26Al yields for AGB stars of different initial masses and metallicities, and these are employed in an equilibrium chemical evolution model. The intensity of the 1.809 MeV line emission resulting from the residual 26Al in the interstellar medium is calculated as a function of longitude in the galactic plane. Emissivity distributions corresponding to observed distributions of AGB stars and a star forming spiral galaxy describable by spiral density wave theory are considered. Key words: GALAXY: EVOLUTION GAMMA RAYS: THEORY - NUCLEAR REACTIONS, NUCLEOSYNTHESIS, ABUNDANCES STARS: ABUNDANCES - STARS: LATE TYPE

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