The lambda 6708 feature in Ap stars

The line Li I 6708 has been sought in a sample of spectra of slow-rotating Ap stars, selected on the basis of their richness in metallic lines. The problem of the determination of the atmospheric parameters T eff and log g from colour indices is discussed. More than 20 per cent of the stars show an absorption line at λ6708, but the presence of this feature, among Ap stars, appears to be erratic. Its identification as Li I is discussed and the parameters needed to obtain meaningful lithium abundances are examined.