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

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 d...

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Bibliographic Details
Published in:Proceedings of the International Astronomical Union 2005-05, Vol.1 (S228), p.497-499
Main Authors: Uttenthaler, Stefan, Aringer, Bernhard, Gorfer, Michael, Hron, Josef, Käufl, Hans-Ulrich, Lebzelter, Thomas
Format: Article
Language:English
Subjects:
Atmospheric models
Contributed Papers
Progress reports
Stars & galaxies
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Summary: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 (J – K) 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.
ISSN:1743-9213
1743-9221
DOI:10.1017/S1743921305006332