The physics and chemistry of circumstellar envelopes of S-stars on the AGB
Konferensbidrag (offentliggjort, men ej förlagsutgivet), 2008

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.

Författare

S. Ramstedt

Fredrik Schöier

Chalmers, Institutionen för radio- och rymdvetenskap, Nationella anläggningen för radioastronomi

Hans Olofsson

Chalmers, Institutionen för radio- och rymdvetenskap, Nationella anläggningen för radioastronomi

in Proceedings of "Organic Matter in Space", Hong Kong feb. 18-22, 2008, IAU symposium 251, eds. S. Kwok, S. Sandfjord, Cambridge University Press

167-168

Ämneskategorier

Astronomi, astrofysik och kosmologi

ISBN

9780521889827