Synthesis of stellar MG and Fe absorption indices 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 A. 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 from -0.50 to 1.00, with the step of 0.50 dex. The spectral indices refer to Fe and Mg features, namely Fe 5270 and Fe 5335, Mg(b), Mg(1), and Mg(2). Here we present the grids of these synthetic spectral indices and their dependence on the main atmospheric stellar parameters, namely effective temperature, surface gravity, and metallicity.