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We provide a homogeneous library of high-resolution, high-S/N spectra for 48bright AFGKM stars, some of them approaching the quality of solar-flux spectra.Our sample includes the northern Gaia benchmark stars, some solar analogs, andsome other bright Morgan-Keenan (M-K) spectral standards. Well-exposed deepspectra were created by average-combining individual exposures. Thedata-reduction process relies on adaptive selection of parameters by usingstatistical inference and robust estimators.We employed spectrum synthesistechniques and statistics tools in order to characterize the spectra and give afirst quick look at some of the science cases possible. With an averagespectral resolution of R=220,000 (1.36 km/s), a continuous wavelength coveragefrom 383 nm to 912 nm, and S/N of between 70:1 for the faintest star in theextreme blue and 6,000:1 for the brightest star in the red, these spectra arenow made public for further data mining and analysis. Preliminary resultsinclude new stellar parameters for 70 Vir and alpha Tau, the detection of therare-earth element dysprosium and the heavy elements uranium, thorium andneodymium in several RGB stars, and the use of the 12C to 13C isotope ratio forage-related determinations. We also found Arcturus to exhibit few-percent CaIIH&K and H-alpha residual profile changes with respect to the KPNO atlas takenin 1999.

PEPSI deep spectra. II. Gaia benchmark stars and other M-K standards