Uvby-beta photometry of high-velocity and metal-poor stars. II - Intrinsic color and metallicity calibrations

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Interstellar Extinction, Metallicity, Stellar Color, Stellar Spectrophotometry, Ubv Spectra, F Stars, G Stars, High Speed, Late Stars, Radial Velocity

Scientific paper

The results of uvby-beta photometry of 711 high-velocity metal-poor stars are employed to obtain new (b-y)0 - beta and semiforbidden Fe/H calibrations. It is found that the interstellar color excess E(b-y) can be calculated with a standard deviation of 0.01 m for beta values as low as 2.55, and that the standard deviation of forbidden Fe/H increases from about 0.15 dex for a forbidden Fe/H abundance ratio of about -0.5 to about 0.30 dex for a forbidden Fe/H abundance ratio of about -2.5. The present calibrations have application to metal-poor, late-F, and G stars, and can be used to determine the age-metallicity-kinematic relations of halo and old disk population stars.

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