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The physics and chemistry of circumstellar envelopes of S-stars on the AGB
Stockholm University, Faculty of Science, Department of Astronomy.
Stockholm University, Faculty of Science, Department of Astronomy.
2008 (English)In: Proceedings of the International Astronomical Union, ISSN 1743-9213, E-ISSN 1743-9221, Vol. 4, no S251, 167-168 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2008. Vol. 4, no S251, 167-168 p.
Keyword [en]
Stars: AGB and post-AGB, (stars:) circumstellar matter, stars: mass loss, stars: abundances
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-18325DOI: 10.1017/S1743921308021479OAI: oai:DiVA.org:su-18325DiVA: diva2:184848
Available from: 2009-01-25 Created: 2009-01-25 Last updated: 2017-12-13Bibliographically approved

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