Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...225..496b&link_type=abstract
Astrophysical Journal, Part 1, vol. 225, Oct. 15, 1978, p. 496-513.
Astronomy and Astrophysics
Astrophysics
14
B Stars, Galactic Structure, O Stars, Radial Velocity, Spiral Galaxies, Stellar Motions, Cepheid Variables, Density Wave Model, Early Stars, Galactic Evolution, Galactic Nuclei, Galactic Rotation, Kinematics, Open Clusters, Velocity Distribution
Scientific paper
The radial velocities of 1018 O and B stars, Cepheid variables, and open star clusters are analyzed to determine whether the Galaxy exhibits an expansion radially outward with speed proportional to distance from the galactic center. A global solution with all the relevant parameters solved for simultaneously is obtained, and a value for the projected distance (R) from the sun to the galactic center is determined from the kinematics. The discrepant values of R are examined which would be obtained if the standard methods of Feast and Shuttleworth (1965) and Trumpler and Weaver (1953) were applied to the velocity field of the preferred solution. It is found that the data are inconsistent with the hypothesis that the local compression of the velocity field indicated by proper motions and radial velocities is due to a global expansion of the Galaxy with expansion speed decreasing with increasing galactocentric distance. The results are shown to be consistent with the density-wave model.
Byl John
Ovenden Michael W.
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