CPL - Chalmers Publication Library
| Utbildning | Forskning | Styrkeområden | Om Chalmers | In English In English Ej inloggad.

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

S. Ramstedt ; Fredrik L. Schöier (Institutionen för radio- och rymdvetenskap, Nationella anläggningen för radioastronomi) ; Hans Olofsson (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 p. 167-168. (2008)
[Konferensbidrag, övrigt]

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.



Denna post skapades 2008-10-28. Senast ändrad 2014-09-02.
CPL Pubid: 76497

 

Institutioner (Chalmers)

Institutionen för radio- och rymdvetenskap, Nationella anläggningen för radioastronomi (2005-2010)

Ämnesområden

Astronomi, astrofysik och kosmologi

Chalmers infrastruktur