Non-LTE gallium abundance in HgMn stars

We present, for the first time, the Non-LTE gallium equivalent widths for t he most prominent gallium transitions as identified in real spectra and in (hot) mercury-manganese star. The common feature of the departure coefficie nts is to decrease near the stellar surface, the collision rates are domina nt in many cases and the Non-LTE equivalent widths are generally smaller. I n particular, the abundance difference as derived from UV and visual lines is reduced. The photoionization cross sections were computed by means of st andard R-matrix formalism.