High resolution synthetic stellar libraries are of fundamental importance for the preparation of the Gaia Mission .
We present new sets of spectral stellar libraries covering two spectral ranges : 300 –1100 nm at 0.1 nm resolution , and 840 – 890 nm at 0.001 nm resolution .
These libraries span a large range in atmospheric parameters , from super-metal-rich to very metal-poor ( -5.0 < [ Fe/H ] < +1.0 ) , from cool to hot ( T { } _ { eff } =3000–50000 K ) stars , including peculiar abundance variations .
The spectral resolution , spectral type coverage and number of models represent a substantial improvement over previous libraries used in population synthesis models and in atmospheric analysis .