A new extensive grid of synthetic Strömgren colors and bolometric corrections is presented for F - M type dwarf and giant stars having 3000K \leq T _ { eff } \leq 8000K , 0.0 \leq log g \leq 5.0 , and - 3.0 \leq [ Fe/H ] \leq 0.5 .
These purely theoretical colors are placed on the observational system using color calibrations derived from uvby photometry of nearby field stars having Hipparcos parallaxes and effective temperatures determined by the infrared flux method .
Modern isochrones transformed to the observed plane using the resultant color-temperature relations are able to reproduce the uvby color-magnitude diagrams of several open and globular clusters ( notably M 67 , M 92 , and 47 Tuc ) quite satisfactorily .