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Age-Metallicity Relation, [Fe/H] and [α/Fe] vertical gradients in the Milky Way from the SDSS–DR5 spectroscopic database

Published online by Cambridge University Press:  01 October 2007

C. Morossi ,
M. Franchini ,
P. Di Marcantonio  and
M. L. Malagnini
C. Morossi
Affiliation:
INAF – Osservatorio Astronomico di Trieste, Via G.B. Tiepolo, 11, I–34143 Trieste, Italy email: morossi@oats.inaf.it
M. Franchini
Affiliation:
INAF – Osservatorio Astronomico di Trieste, Via G.B. Tiepolo, 11, I–34143 Trieste, Italy email: morossi@oats.inaf.it
P. Di Marcantonio
Affiliation:
INAF – Osservatorio Astronomico di Trieste, Via G.B. Tiepolo, 11, I–34143 Trieste, Italy email: morossi@oats.inaf.it
M. L. Malagnini
Affiliation:
INAF – Osservatorio Astronomico di Trieste, Via G.B. Tiepolo, 11, I–34143 Trieste, Italy email: morossi@oats.inaf.it Dipartimento di Astronomia, Università degli Studi di Trieste, Italy email: malagnini@oats.inaf.it
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Abstract

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Spectra of FGK stars were selected from the SDSS–DR5 spectroscopic database to investigate the Age-Metallicity relation and the [Fe/H] and [α/Fe] vertical gradients in the Milky Way. Atmospheric parameters and [α/Fe] were derived by comparing synthetic and measured Lick/SDSS spectral indices. Results were checked and complemented by analyzing solar neighbourhood stars. Spectroscopic distances and ages were obtained for a subsample of ~2000 stars using theoretical isochrones via a Bayesian approach. The resulting Age-Metallicity diagram and the [Fe/H] and [α/Fe] vertical gradients are presented.

Keywords

stars: abundancesstars: fundamental parametersGalaxy: stellar content

References

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