Metallicities and radial velocities of old open clusters

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Galactic Structure, Metallicity, Open Clusters, Radial Velocity, Abundance, Milky Way Galaxy

Scientific paper

Medium resolution spectra of giant stars in 24 open clusters with ages greater than about 1 Gyr have been obtained and analyzed to provide radial velocities accurate to 10-15 km/s and (Fe/H) metallicities accurate to 0.15 dex. The radial velocities of the older cluster systems are consistent with those expected from the reflex of solar motion and simple Galactic rotation. The cluster kinematics suggest strongly that they are drawn from the old thin disk stellar population. An abundance gradient in the Galactic disk of -0.09 +/- 0.02 dex/kpc is found. This gradient is in good agreement with that found for samples of younger open clusters, suggesting that there has been little change in the Galactic radial abundance gradient over time. The cluster sample shows no correlation between age and metallicity, regardless of Galactocentric radius. The clusters show an unexpected correlation between the Mg line strength and age of the cluster at a fixed metallicity. Possible reasons for this are discussed.

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