SYNTHESIS OF STELLAR MG AND FE ABSORPTION INDEXES FOR STELLAR POPULATION STUDIES

A library of synthetic stellar fluxes, based on a recent grid of model atmospheres (Kurucz 1992), has been computed in the wavelength range 4850-5400 angstrom. A set of spectral indices has been derived in the effective temperature range 4000-6000 K, with a step of 250 K, surface gravity from 1.5 to 4.5 at an interval of 0.50 dex, and metallicity f rom -0.50 to 1.00, with the step of 0.50 dex. The spectral indices ref er to Fe and Mg features, namely Fe5270 and Fe5335, Mgb, Mg1, and Mg2. Here we present the grids of these synthetic spectral indices and the ir dependence on the main atmospheric stellar parameters, namely effec tive temperature, surface gravity, and metallicity.