Non-LTE Abundances in OB stars: Preliminary Results for 5 Stars in the   Outer Galactic Disk
  The aim of this study is to analyse and determine elemental abundances for a large sample of distant B stars in the outer Galactic disk in order to constrain the chemical distribution of the Galactic disk and models of chemical evolution of the Galaxy. Here, we present preliminary results on a few stars along with the adopted methodology based on securing simultaneous O and Si ionization equilibria with consistent NLTE model atmospheres. 
G. A. Bragan\c{c}a, T. Lanz, S. Daflon, K. Cunha, C. D. Garmany, J. W.   Glaspey, M. Borges Fernandes, M. S. Oey, T. Bensby,...
astro-ph.SR