Accuracy of abundance determinations by weighting functions method of curves of growth

Study of curve of growth abundance determinations is performed for the method of weighting functions. We evaluated abundances of iron for 15 stars changing their effective temperatures and gravities within the mean error of determination of these parameters, i.e.θ _eff ± 0.05θ _eff and logg ± 0.5. Wide range of spectral types of stars taken into account, permits analysis of accuracy of abundance determinations for large part of H-R diagram. The results prove, that in spite of using the most accurate method of curve of growth analysis, the accuracy of abundance determination (due to errors inT _eff and log g) is sometimes very small (in extreme cases not better than 0.4 dex) and the value of accuracy is connected with of spectral types of stars.