Radial velocities of distant OB stars

Abstract

The results of radial-velocity measurements for twenty-seven faint OB stars at galactic longitudes between l^II = 18° and l^II = 66° are presented. On the basis of spectroscopic absolute magnitudes in the Yerkes system and UBV photometry, the rotational velocities of the stars around the galactic center have been derived. In comparison with the rotational curve indicated by the interstellar neutral hydrogen, the stellar motions suggest rotational velocities lower by about 25 km/sec at distances from the center around half that of the Sun. The general shape of the rotation-curve provided by the new stellar observations remains thus the same as it was found in our previous study.

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