1999A&A...351..981P

High resolution and high signal-to-noise CCD spectra were analyzed to determine accurate LTE abundances for seven well established λBootis stars (a group of A to F-type stars with strong underabundances of Fe-peak elements whereas the C, N, O and S appear to be solar abundant): HD 31295, HD 125162, HD 142994, HD 149303, HD 192640, HD 204041 and HD 221756. In general, 13 elements were investigated. The effective temperatures of our program stars range from 7200 to 9000K. The main results are the following: C, O, Na and S seem to be nearly solar abundant for all investigated stars. A wide range of underabundances within the individual stars exists for all other elements. No correlation of the individual abundances with astrophysical parameters such as T_eff, logg and vsini was found. These results are consistent with the accretion/diffusion model which is currently adopted for the explanation of the λ Bootis phenomenon.