Astronomy and Astrophysics – Astrophysics
Scientific paper
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.
Nissen Poul Erik
Schuster William J.
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