DISTANCE MEASUREMENTS TOWARDS YOUNG MILKY WAY OBJECTS; ROTATION CURVE

Abstract

The paper discusses existing methods of distance determinations to bright objects inside our Galaxy. Possible inaccuracies are considered. Measurements of both: distances and radial velocities allow determination of the Milky Way rotation curve, believed to be flat because of the postulated Dark Matter halo around the Galaxy. We demonstrate the rotation curve, based on observations of Caii interstellar absorption lines in spectra of OB stars. Our high resolution spectra allow to measure both: distances and radial velocities with a high precision -free of the effects of stellar binarity and the line center uncertainties in rapid rotators. The resultant rotation curve of the Milky Way proves to be much more complex than either ^,,flat^,, or ^,,keplerian^,,