Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sf2a.conf..339g&link_type=abstract
SF2A-2006: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: D. Barret, F. Casoli, G.
Astronomy and Astrophysics
Astrophysics
Scientific paper
I present TGMETα, a method developed in order to determine Teff, logg, [Fe/H] and [α/Fe] for large samples of FGK stars at various spectral resolutions. TGMETα is a minimum distance algorithm based on the χ2 comparison of an observed spectrum to a grid of synthetic spectra. The results of TGMETα have been extensively tested against several hundreds spectra of reference stars with atmospheric parameters and abundances known from the literature. Typical rms precisions at high resolution are σTeff˜140 K, σlogg˜0.27, σ[Fe/H]˜0.14 and σ[α/Fe]˜0.05. The algorithm was run on nearly 2000 ELODIE echelle spectra in order to build a large sample of stars with kinematics, metallicity and [α/Fe]. This new sample was used to investigate the properties of Milky Way's thin disk and thick disk.
Girard Pascal
Soubiran Caroline
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