Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...18110909b&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #109.09; Bulletin of the American Astronomical Society, Vol. 24, p.1297
Astronomy and Astrophysics
Astronomy
Scientific paper
The deep convective envelopes of asymptotic giant branch (AGB) stars develop deep convective envelopes which can reach CNO cycle processing temperatures at their base (for stellar masses >4 msol . This can produce radioactive species \bes,\natt, and \altsx. \bes and \natt have lifetimes which are comparable to the convective turnover time of the stellar envelope. This necessitates the use of a full convective diffusion scheme. We have found that \altsx production is also affected to a noticeable degree by a more precise treatment of convective diffusion. We use parameterized models of AGB star cores with convective diffusion in a complete envelope model which includes the effects of energy generation to explore the large available region of parameter space available to current AGB models. We will present results for the surface and stellar wind abundances of \bes, \natt, and \altsx and discuss the sensitivity necessary to observe their gamma -ray line emission from a single AGB star or planetary nebula. Preliminary results suggest that \bes observation is impossible and will probably remain so, but \natt and \altsx may be observable by C-GRO or the next generation of gamma -ray telescopes.
Bazan Grant
Brown Lawrence E.
Clayton Donald D.
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