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The spectral predictions of stellar population models are not as accurate inthe ultra-violet (UV) as in the optical wavelength domain. One of the reasonsis the lack of high-quality stellar libraries. The New Generation StellarLibrary (NGSL), recently released,represents a significant step towards theimprovement of this situation. To prepare NGSL for population synthesis, wedetermined the atmospheric parameters of its stars, we assessed the precisionof the wavelength calibration and characterised its intrinsic resolution. Wealso measured the Galactic extinction for each of the NGSL stars. For ouranalyses we used ULySS, a full spectrum fitting package, fitting the NGSLspectra against the MILES interpolator. We find that the wavelength calibrationis precise up to 0.1 px, after correcting a systematic effect in the opticalrange. The spectral resolution varies from 3{\AA} in the UV to 10{\AA} in thenear-infrared (NIR), corresponding to a roughly constant reciprocal resolutionR ~ 1000 and an instrumental velocity dispersion $\sigma_{ins}$ ~ 130 km/s. Wederived the atmospheric parameters homogeneously. The precision for the FGKstars is 42K, 0.24 and 0.09 dex for Teff, logg and [Fe/H], respectively. Thecorresponding mean errors are 29K, 0.50 and 0.48 dex for theMstars, and for theOBA stars they are 4.5 percent, 0.44 and 0.18 dex. The comparison with theliterature shows that our results are not biased.

Stellar population models in the UV: I. Characterisation of the New Generation Stellar Library