A 325 SQUARE DEGREE SURVEY OF B-TYPE STARS AT HIGH GALACTIC LATITUDES

Final results from model atmosphere analyses of all blue stars in a si milar to 325 square degree region of the Galactic halo are presented. A kinematic analysis reveals the presence of one star which cannot hav e been ejected from the disk according to contemporary theories. Ten o ther objects have, however, evolutionary times consistent with classif ication as disk runaway stars. Our results therefore imply the existen ce of some 200 stars in the Galaxy unexplainable in terms of disk ejec tion models, and set a lower limit of 10,000 runaway halo B-type stars .