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

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

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...251..457n&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 2, Nov. 1991, p. 457-468. Research supported by CONACYT.

Astronomy and Astrophysics

Astrophysics

80

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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