Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-06-30
Astronomy and Astrophysics
Astrophysics
21 pages, 5 eps figure, accepted for publication in Astronomical Journal (Oct 2004 issue)
Scientific paper
10.1086/423912
We report on high resolution spectroscopy of four giant stars in the Galactic old open clusters Berkeley~29 and Saurer~1 obtained with HIRES at the Keck telescope. These two clusters possess the largest galactocentric distances insofar known for open star clusters, and therefore are crucial objects to probe the chemical pattern and evolution of the outskirts of the Galactic disk. We find that $[Fe/H]=-0.38\pm0.14$ and $[Fe/H]=-0.44\pm0.18$ for Saurer 1 and Berkeley~29, respectively. Based on these data, we first revise the fundamental parameters of the clusters, and then discuss them in the context of the Galactic disk radial abundance gradients. Both clusters seem to significantly deviate from the general trend, suggesting that the outer part of the Galactic disk underwent a completely different evolution compared to the inner disk. In particular Berkeley~29 is clearly associated with the Monoceros stream, while Saurer~1 exhibits very different properties. The abundance ratios suggest that the chemical evolution of the outer disk was dominated by the Galactic halo.
Bresolin Fabio
Carraro Giovanni
Matteucci Francesca
Patat Ferdinando
Romaniello Martino
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