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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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