Library of FOE spectra of late-type stars

These spectra include many of the spectral lines most widely used as optical and near-infrared indicators of chromospheric activity such as the Balmer lines (H{alpha} to H{delta}), Ca II H & K, the Mg I b triplet, Na I D_1_, D_2_, He I D_3_, and Ca II IRT lines.

There are also a large number of photospheric lines, which can also be affected by chromospheric activity, and temperature-sensitive photospheric features such as TiO bands. The spectra have been compiled with the goal of providing a set of standards observed at medium resolution. We have extensively used such data for the study of active chromosphere stars by applying a spectral subtraction technique.