THE DISTRIBUTION OF OB STARS IN THE DIRECTIONS OF THE STELLAR ASSOCIATIONS AUR OB-1 AND 2

42 OB stars have been observed with the space telescope Glazar at 1640 Angstrom in an area of about 17 deg(2) in the direction of the stella r associations Aur OB 1 and 2. Twenty-five of the observed stars of kn own spectral type and with colorimetric data are assigned to four star groups: a B association at a distance of 600 pc and three O associati ons at distances of 1100, 2000 and 3000 pc respectively, designated Au r B 0.6, Aur OB 1.1, Aur OB 2.0 and Aur OB 3.0. 14 stars of unknown sp ectral type should be OB or at least early-A-type stars, since their i mages were obtained on photographs taken with Glazar. The latest possi ble spectral types of these stars and also of stars for which the spec tral types are known only roughly are determined. There is a more or l ess uniform dust cloud in front of the dense parts of the three distan t associations, which introduces an extinction of about 3.5 mag at 164 0 Angstrom. Within the O-type stellar associations the dust is concent rated in comparatively small clouds and the space between these associ ations is free of dust.