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Paper: The Mass-Loss Rates and Molecular Abundances of S-type AGB Stars
Volume: 445, Why Galaxies Care about AGB Stars II: Shining Examples and Common Inhabitants
Page: 263
Authors: Ramstedt, S.; Schöier, F. L.; Olofsson, H.
Abstract: The S-type stars are believed to have a C/O ratio close to unity (within a few percent). They are considered to represent an intermediate evolutionary stage as AGB stars evolve from oxygen-rich M stars into carbon stars. As possible transition objects the S stars could give important clues to the mass-loss mechanism(s) and to the chemical evolution along the AGB. Using observations of circumstellar radio line emission in combination with a detailed radiative transfer analysis, we have estimated mass-loss rates and abundances of chemically important molecules (SiO, HCN) for a sample of 40 S-type AGB stars. The results are compared to previous results for M-type and carbon stars.
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