  We report on preliminary results of a hybrid non-LTE analysis of
high-resolution, high-S/N spectra of the helium-rich subdwarf B star Feige49
and the helium-poor sdB HD205805. Non-LTE effects are found to have a notable
impact on the stellar parameter and abundance determination. In particular the
HeI lines show significant deviations from detailed balance, with the computed
equivalent widths strengthened by up to ~35%. Non-LTE abundance corrections for
the metals (C, N, O, Mg, S) are of the order ~0.05-0.25 dex on the mean, while
corrections of up to ~0.7 dex are derived for individual transitions. The
non-LTE approach reduces systematic trends and the statistical uncertainties in
the abundance determination. Consequently, non-LTE analyses of a larger sample
of objects have the potential to put much tighter constraints on the formation
history of the different sdB populations than currently discussed.
