The Effective Temperature Scale of FGK Stars. II.<i>T</i>_eff: Color : [Fe/H] Calibrations

Abstract

We present up-to-date metallicity-dependent temperature vs. color\ncalibrations for main sequence and giant stars based on temperatures derived\nwith the infrared flux method (IRFM). Seventeen colors in the following\nphotometric systems: UBV, uvby, Vilnius, Geneva, RI(Cousins), DDO,\nHipparcos-Tycho, and 2MASS, have been calibrated. The spectral types covered\nrange from F0 to K5 (7000 K&lt;Teff&lt;4000 K) with some relations extending below\n4000 K or up to 8000 K. Most of the calibrations are valid in the metallicity\nrange -3.5&lt;[Fe/H]&lt;0.4, although some of them extend to as low as [Fe/H]=-4.0.\nAll fits to the data have been performed with more than 100 stars; standard\ndeviations range from 30 K to 120 K. Fits were carefully performed and\ncorrected to eliminate the small systematic errors introduced by the\ncalibration formulae. Tables of colors as a function of Teff and [Fe/H] are\nprovided. (Abridged)\n