Uvby-beta photometry of high-velocity and metal-poor stars. V - Distances, kinematics and ages of halo and disk stars

Astronomy and Astrophysics – Astrophysics

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Astronomical Photometry, Galactic Evolution, Halos, Milky Way Galaxy, Stellar Motions, Stellar Structure, Metallicity, Stellar Luminosity, Stellar Magnitude, Ubv Spectra

Scientific paper

An absolute magnitude calibration is derived for F and G dwarfs and subgiants with metallicities ranging from about -3.0 to about 0.0 Fe/H abundances via uvby-beta photometry by Schuster and Nissen (1988). The resulting distances are estimated to have errors of typically 20 percent, which is confirmed from a comparison with trigonometric distances for a subset of the stars. The new distances and published radial velocities and properties are used to calculate space velocities for 611 high-velocity stars to an accuracy of typically 20 km/s. Ages of turn-off stars are derived by using isochrones of Vanden Berg (1985). The large majority of the high-velocity disk stars with Fe/H abundances in the range of -1.2 and -0.5 are found to be as old as the halo stars. The significance of this finding for models of Galactic formation and evolution is discussed.

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