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Comparison of Observed and Synthetic Spectra of AGB-Stars: A Progress Report

Published online by Cambridge University Press:  23 December 2005

Stefan Uttenthaler
Affiliation:
ESO, Karl-Schwarzschildstr. 2, D-85748 Garching, Germany email: suttenth@eso.org
Bernhard Aringer
Affiliation:
Department of Astronomy, Türkenschanzstr. 17, A-1180 Vienna, Austria
Michael Gorfer
Affiliation:
Department of Astronomy, Türkenschanzstr. 17, A-1180 Vienna, Austria
Josef Hron
Affiliation:
Department of Astronomy, Türkenschanzstr. 17, A-1180 Vienna, Austria
Hans-Ulrich Käufl
Affiliation:
ESO, Karl-Schwarzschildstr. 2, D-85748 Garching, Germany email: suttenth@eso.org
Thomas Lebzelter
Affiliation:
Department of Astronomy, Türkenschanzstr. 17, A-1180 Vienna, Austria
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Abstract

We have calculated a set of synthetic spectra for AGB-stars using the MARCS-code (Gustafsson et al., 1975) and improved spectral synthesis. Here we investigate the spectral changes as a function of the stellar parameters and we show a comparison of observed high resolution UVES spectra of galactic disk and bulge AGB-stars with calculated synthetic spectra. Using our set of synthetic spectra, we try to determine the stellar parameters using only these and (JK) data (Schultheis 1998). To achieve this, we use a minimal-distance method and search for spectral features which can be used as indicators that are sensitive either only to a change in $T_{eff}$ or only to a change in metallicity $[M/H]$ (where M are all metals from Li to U). In a later stage of the project, we will focus on selected lines of s-process elements in an attempt to achieve a more accurate abundance determination leading to a better understanding of nucleosynthesis and dredge-up processes in these stars.

Type
Contributed Papers
Copyright
© 2005 International Astronomical Union
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Comparison of Observed and Synthetic Spectra of AGB-Stars: A Progress Report
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