Chemical Evolution of the Galactic Disk: Evidence for a Gradient Perpendicular to the Galactic Plane

Details Chemical Evolution of the Galactic Disk: Evidence for a Gradient Perpendicular to the Galactic Plane Chemical Evolution of the Galactic Disk: Evidence for a Gradient Perpendicular to the Galactic Plane

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....110.2813p&link_type=abstract

Astronomical Journal v.110, p.2813

Astronomy and Astrophysics

Astronomy

73

Galaxy: Evolution, Galaxy: Abundances

Scientific paper

An improved DDO abundance calibration presented in a previous paper is used to derive overall [Fe/H] abundances for 233 red giants in a sample of 63 open clusters with a wide range of ages. Membership of the giants in each cluster is confirmed by using velocity, astrometric, and photometric information. The newly derived abundances allow us: (1) to confirm the absence of a global age-metallicity relation for the entire open cluster sample; (2) to define a homogeneous abundance scale for the Galactic open cluster system. If this scale is adopted, a radial abundance gradient (∂[Fe/H]/∂Rgc = -0.07 dex kpc-1) as well as a steeper abundance gradient perpendicular to the Galactic plane (∂[Fe/H]/∂|Z| = -0.34 dex kpc-1) are found. Orbital motions for a subsample of 9 open clusters with sufficiently good distances and kinematical data are calculated by assuming a Miyamoto-type gravitational potential for the Galaxy. The dynamical evolution of each cluster is computed backwards for a time interval equal to its age and some relevant parameters of each cluster orbit are derived. It is found that both the radial and Z gradients determined from the observed cluster positions are very close to the paleogradient ones, namely, the gradients in metallicity of the gas out of which the clusters have been generated.

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