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astro-ph2007
The physics and chemistry of circumstellar envelopes of S-stars on the AGB
S. Ramstedt, F. L. Schoeier, H. Olofsson
The S-stars have been suggested to be a brief transitional phase as stars evolve from oxygen-rich M-type stars into carbon stars, through the dredge up of carbon from He-shell burn…
astro-ph2007
Non-equilibrium chemistry and dust formation in AGB stars as probed by SiO line emission
F. L. Schoeier, H. Olofsson, T. Wong +3
We have performed high spatial resolution observations of SiO line emission for a sample of 11 AGB stars using the ATCA, VLA and SMA interferometers. Detailed radiative transfer mo…