Galactic rotation and local irregularities derived from fundamental proper motions and radial velocities

Details Galactic rotation and local irregularities derived from fundamental proper motions and radial velocities Galactic rotation and local irregularities derived from fundamental proper motions and radial velocities

Sep 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....42..449f&link_type=abstract

Astronomy and Astrophysics, vol. 42, no. 3, Sept. 1975, p. 449-455.

Astronomy and Astrophysics

Astrophysics

27

Galactic Rotation, Radial Velocity, Stellar Motions, Galactic Nuclei, Irregularities, Oort Cloud, Spiral Galaxies, Stellar Evolution

Scientific paper

Results are reported for analysis of the proper motions and radial velocities of 489 FK 4/FK 4 Sup stars of the galactic disk in the distance intervals from 70 to 300 pc and from 300 to 1300 pc. It is noted that the stars at greater distances are concentrated toward the galactic plane while the stars closer than 300 pc are concentrated toward Gould's Belt. The motions of the more distant stars are found to confirm the values of Oort's constants derived by Fricke (1967), and their radial velocities confirm that the direction of the shear in the velocity field due to galactic rotation is identical with the direction of the galactic center. The motions of the nearer stars are found not to indicate any significant deviations from the general field of galactic rotation, and it is concluded that Gould's Belt does not show a rotation or shear different from the general galactic rotation. The motions of nearby stars younger than 40 million years are found to deviate strongly from the galactic rotation, but it is suggested that this effect may result from the superposition of the motions of different groups of younger stars.

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