The physics and chemistry of circumstellar envelopes of S-stars on the AGB

Details The physics and chemistry of circumstellar envelopes of S-stars on the AGB The physics and chemistry of circumstellar envelopes of S-stars on the AGB

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008iaus..251..167r&link_type=abstract

Organic Matter in Space, Proceedings of the International Astronomical Union, IAU Symposium, Volume 251, p. 167-168

Astronomy and Astrophysics

Astronomy

1

Stars: Agb And Post-Agb, (Stars:) Circumstellar Matter, Stars: Mass Loss, Stars: Abundances

Scientific paper

Presented here are the preliminary results of a long-term study of S-stars on the AGB. S-stars are important as possible transition objects between oxygen-rich M-stars and carbon stars. The aim of the study is to compare results from our newly gathered observational database for the S-stars with those already obtained for the M- and carbon stars. We can thus follow the changes as the stars evolve along the AGB and more firmly establish the suggested M-MS-S-SC-C evolutionary sequence. It will also allow us to determine the relative importance of processes such as non-equilibrium chemistry, grain formation, and photodissociation in regulating the chemistry in circumstellar envelopes of AGB stars.

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