This web page provides spectral atlases for 48 bright stars. Our sample includes the northern Gaia benchmark stars, some solar analogs, and some other bright Morgan-Keenan spectral standards. All spectra cover the wavelength range 383-912nm with an average resolution of 220,000. Details are provided in the paper: K. G. Strassmeier, I. Ilyin, and M. Weber, PEPSI deep spectra. II. Gaia benchmark stars and other M-K standards, A&A, 612, A45 (2018).
Two spectra are given per star. One is the final data product including continuum refinement with synthetic spectra and the other is the spectrum without this refinement (At this very moment only the former is available, the latter will also be presented soon.). Attention: The current data were reduced with SDS4PEPSI Version 1.0. Future releases of SDS4PEPSI may change the resulting spectra, in particular the continuum setting of the very blue part of the spectra.
Data are stored as FITS files which contain three columns in double floating point format and one extra column in byte format for masking pixels in the spectrum. The first column is the wavelength for each pixel in the stellar rest frame with the Solar barycentric and SIMBAD stellar radial velocities removed, the second is the continuum normalized intensity, and the last one is the variance for each pixel. Firstly, the radial velocity with value provided by SIMBAD for each star was removed, and secondly, the residual radial velocity was removed again after cross-correlation with respect to a synthetic spectrum. All these radial velocity corrections are given in the FITS header. The UT date, time, and exposure time in the FITS header are referring to the middle of the total exposure time of all combined spectra. Signal/noise given in the FITS header is referring to the median value over the whole spectrum.