A library of high resolution synthetic stellar spectra from 300nm to 1.8 micron with solar and alpha-enhanced composition

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Abstract
A new library of high resolution synthetic spectra is presented ranging from the near-ultraviolet (0.3$\mu m$) to the near-infrared (1.8$\mu m$). The library spans all the stellar types that are relevant to the integrated light of old and intermediate-age stellar populations in the involved spectral region (spectral types F through M and all luminosity classes). The grid was computed for metallicities ranging from [Fe/H] = -2.5 to +0.5, including both solar and $\alpha$-enhanced ([$\alpha$/Fe] = 0.4) chemical compositions. The synthetic spectra are a good match to observations of stars throughout the stellar parameter space encompassed by the library and over the whole spectral region covered by the computations. This is the first library of high resolution stellar spectra in the literature that covers a wide wavelength range and includes both solar scaled and $\alpha$-enhanced chemical compositions.

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