Abstract
On two Fabry-Perot interferograms, radial velocities from the Hα line at about 100 points in the HII region complex, NGC 6164-6165, are obtained. The velocity field shows considerable complexity, yet, axial symmetry around the exciting star HD 148937, O6f, is clearly present. Average velocities of NGC 6164 and 6165, +20 and -43 km sec-1, respectively, lead to the plausible interpretation that one is observing the expansion of gas ejected from the O6f star. Direct photographs reveal a number of blobs with striking symmetry with respect to the central star. The novel and amazing outcome of the F-P velocities is that, at least at 5 different spots two neighboring points at a characteristic distance of 20", corresponding to 0.15 pc, show a difference in radial velocity of the order of 50 km sec-1; these points normally correspond to well defined blobs. Two tentative models to account for the observations are presented.
