On-line determination of stellar atmospheric parameters T-eff, log g, [Fe/H] from ELODIE echelle spectra II. The library of F5 to K7 stars

A library of 211 echelle spectra taken with ELODIE at the Observatoire de H aute-Provence is presented. It provides a set of spectroscopic standards co vering the full range of gravities and metallicities in the effective tempe rature interval [4000 K; 6300 K]. The spectra are straightened, wavelength calibrated, cleaned of cosmic ray hits, bad pixels and telluric Lines. They cover the spectral range [440 nm: 680 nm] with an instrumental resolution of 42000. For each star, basic data were compiled from the Hipparcos catalo gue and the Hipparcos Input Catalogue. Radial velocities with a precision b etter than 100 m s(-1) are given. Atmospheric parameters (T-eff, log g, [Fe /H]) from the literature are discussed. Because of scattered determinations in the bibliography, even for the most well-known stars; these parameters were adjusted by an iterative process which takes account of common or diff erent spectral features between the standards, using our homogeneous set of spectra. Revised values of effective temperature, gravity and metallicity are proposed. They are still consistent with the literature, and also lead to the self-consistency of the library, in the sense that similar spectra h ave similar atmospheric parameters. This adjustment was performed by using step by step a method based on the least square comparison of carefully pre pared spectra, which was originally developed for the on-line estimation of the atmospheric parameters of faint field stars (companion paper in the ma in journal).