Intro
Gα models are high resolution synthetic spectral models for stellar populations.
These models are based on a recent library of synthetic stellar spectra and a new library of stellar evolutionary tracks, both computed for three different iron abundances ([Fe/H] = -0.5, 0.0 and 0.2) and two different α-elements-to-iron abundance ratios ([α/Fe] = 0.0 and 0.4). The models cover the wavelength range from 300 to 1340nm at a constant resolution of FWHM = 1 Å and a sampling of 0.2 Å/pix, for overall metallicities in the range 0.005 <= Z <= 0.048 and for stellar population ages between 3 and 12 Gyr.
We expect our fully synthetic models to be primarily useful for evaluating the differential effect of changes in the α/Fe ratio on observables such as broad-band colours and narrow spectral features.
The SSP and the stellar spectral models can be downloaded here, and documentation and related papers can be found here.