A New Metallicity Calibration for Dwarf Stars with RGU-Photometry

Authors : Salih KARAALİ, Selçuk BİLİR

Pages : 427-434

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Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :We have adopted the procedure of Carney to obtain a metallicity calibration for dwarfs utilising RGU-photometry. For this purpose we selected 76 dwarfs of different metallicities from Carney and from Strobel et al., and evaluated their d insert ignore into journalissuearticles values(U-G); ultra-violet excess relative to the Hyades by transforming UBV magnitudes to RGU via the metallicity dependent equations of Ak-Güngör. The d0.6/d M normalized factors of Sandage transform d insert ignore into journalissuearticles values(U-G); excess at any G-R to d \equiv d1.08, i.e. the ultra-violet excess at G-R = 1.08 mag, corresponding to B-V = 0.60 mag in the UBV-system. Finally, the insert ignore into journalissuearticles values(d, [Fe/H]); pairs were shown to be fitted by the equation [Fe/H] = 0.11-2.22 d-7.95 d2. This calibration covers the metallicity interval insert ignore into journalissuearticles values(-2.20, +0.20); dex.
Keywords : Metallicity RGU photometry Galactic structure