Key points are not available for this paper at this time.
We present up-to-date metallicity-dependent temperature vs. color for main sequence and giant stars based on temperatures derived the infrared flux method (IRFM). Seventeen colors in the following systems: UBV, uvby, Vilnius, Geneva, RI (Cousins), DDO, -Tycho, and 2MASS, have been calibrated. The spectral types covered from F0 to K5 (7000 K<Teff<4000 K) with some relations extending below4000 K or up to 8000 K. Most of the calibrations are valid in the metallicity -3. 5<Fe/H<0. 4, although some of them extend to as low as Fe/H=-4. 0. fits to the data have been performed with more than 100 stars; standard range from 30 K to 120 K. Fits were carefully performed and to eliminate the small systematic errors introduced by the formulae. Tables of colors as a function of Teff and Fe/H are. (Abridged)
Ramírez et al. (2005) studied this question.