Journals / Turkish Journal of Physics / 2002 / Cilt: 26 - Sayı: 6
A New Metallicity Calibration for Dwarf Stars with RGU-Photometry
- Journal
- Turkish Journal of Physics
- Pages
- 427–434
- DOI
- —
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 (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 (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 (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 (-2.20, +0.20) dex.
Özet
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 (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 (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 (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 (-2.20, +0.20) dex.