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Towards abundance determination from dynamic atmospheres
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2006 (English)In: Memorie della Societa Astronomica Italiana, v.77, 2006, 1008-1013 p.Conference paper (Other scientific)
Abstract [en]

We summarize our efforts to determine element abundances (e.g. for the elements C and O) and isotopic ratios (e. g. isotope[12]{C}/isotope[13]{C}) along the Asymptotic Giant Branch (AGB). For the modelling of AGB star spectra for stars on the lower part of the AGB, hydrostatic model atmospheres have been shown to reproduce observations quite well. Stars climbing up the AGB get more and more dynamic. For these strongly pulsating stars dynamic model atmospheres have to be used in order to reproduce the observed spectra which are dominated by dynamical effects. Both the developments of hydrostatic and dynamic model atmospheres are considered, referring to the problems encountered in the synthesis of cool star spectra. We emphasize the importance of AGB stars in globular clusters, which provide a method to get a homogenous sample of stars well-defined in mass, metallicity, and luminosity. Finally, we point out the relevance of our investigations for stellar evolutionary models.

Place, publisher, year, edition, pages
2006. 1008-1013 p.
Keyword [en]
Stars: AGB and post-AGB, Stars: abundances, Stars: atmospheres, globular clusters, Nuclear reactions, nucleosynthesis, abundances
URN: urn:nbn:se:uu:diva-25962OAI: oai:DiVA.org:uu-25962DiVA: diva2:53736
Available from: 2007-02-14 Created: 2007-02-14

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Höfner, Susanne
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Department of Astronomy and Space Physics

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