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One of the main goals of the COROT mission is to get precise photometricobservations of selected bright stars in order to allow the modelling of theirinterior through asteroseismology. However, in order to interpret theasteroseismological data, the effective temperature, surface gravity, andchemical composition of the stars must be known with sufficient accuracy. Tocarry out this task, we have developed a spectroscopic method called APASS(Atmospheric Parameters and Abundances from Synthetic Spectra) which allowsprecise analysis of stars with a moderate to high rotational velocity, which isthe case for most primary COROT targets. Our method is based on syntheticspectra and works differentially with respect to the Sun. Using highsignal-to-noise spectra and the APASS method, we determined the atmosphericparameters and chemical abundances of 13 primary COROT targets. Our resultsagree well with those obtained by Bruntt using his software VWA and with thoseobtained with the software TEMPLOGG. However, in both cases, our error bars aresignificantly smaller than those of other methods. Our effective temperaturesare also in excellent agreement with those obtained with the IR photometrymethod. For five stars with relatively low rotational velocity, we alsoperformed an analysis with a classical equivalent-width method to testagreement with APASS results. We show that equivalent-width measurements byGaussian or Voigt profile-fitting are sensitive to the rotational broadening,leading to systematic errors whenever the projected rotation velocity isnon-negligible. The APASS method appears superior in all cases and should thusbe preferred.Comment: 12 pages, 6 figures, 4 tables. Accepted in A&

High precision determination of the atmospheric parameters and abundances of the COROT main targets