The local complex of O and B stars. II - Kinematics

Details The local complex of O and B stars. II - Kinematics The local complex of O and B stars. II - Kinematics

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977aj.....82..890f&link_type=abstract

Astronomical Journal, vol. 82, Nov. 1977, p. 890-901.

Astronomy and Astrophysics

Astronomy

48

B Stars, Body Kinematics, O Stars, Stellar Motions, Galactic Rotation, Interstellar Matter, Oort Cloud, Radial Velocity, Stellar Evolution, Velocity Distribution

Scientific paper

The observed space velocities of O-B5 stars lying within about 1 kpc of the sun are analyzed. Motions examined include local solar motion, differential galactic rotation, mean peculiar stellar velocities, and systematic stellar motions parallel and perpendicular to the galactic plane. Kinematical determinations of the Oort constant and the K term for stars previously classified as members of the Gould and galactic belts are found to confirm earlier results that the Gould belt (or at least its youngest component) comprises a local perturbation in the general galactic velocity field. It is shown that if the Gould belt is expanding as a unit, its expansion age must be about 70 million years. The analyses also indicate negligibly small translational motion of the Gould belt relative to the galactic belt and parallel to the galactic plane as well as an approximate 'seesaw' motion of the Gould belt about the Cassiopeia-Carina line in the galactic plane. The age of the Gould belt is inferred to be either 20 or 60 million years from the vertical motions, which would imply the existence of either one or two waves of star formation as the Gould belt passed through the galactic belt either once or twice.

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