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We have made a detailed spectral analysis of eleven Wide Angle Search forPlanets (WASP) planet host stars using high signal-to-noise (S/N) HARPSspectra. Our line list was carefully selected from the spectra of the Sun andProcyon, and we made a critical evaluation of the atomic data. The spectrallines were measured using equivalent widths. The procedures were tested on theSun and Procyon prior to be being used on the WASP stars. The effectivetemperature, surface gravity, microturbulent velocity and metallicity weredetermined for all the stars. We show that abundances derived from high S/Nspectra are likely to be higher than those obtained from low S/N spectra, asnoise can cause the equivalent width to be underestimated. We also show thatthere is a limit to the accuracy of stellar parameters that can be achieved,despite using high S/N spectra, and the average uncertainty in effectivetemperature, surface gravity, microturbulent velocity and metallicity is 83 K,0.11 dex, 0.11 km/s and 0.10 dex respectively.

Accurate spectroscopic parameters of WASP planet host stars