Statistics
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206...57o&link_type=abstract
Astrophysical Journal, vol. 206, May 15, 1976, pt. 1, p. 57-65.
Statistics
7
Astrodynamics, Astronomical Models, Milky Way Galaxy, Radial Velocity, Stellar Motions, B Stars, Cepheid Variables, Dynamic Models, Gravitational Constant, Mass Transfer, O Stars, Open Clusters, Tables (Data)
Scientific paper
The radial velocities of more than 1000 O and B stars, Cepheids, and open clusters have been analyzed with a view to determining any systematic expansion of the Galaxy. Provided that adequate allowance is made for velocity dispersion, there is an indication of a K term (constant and independent of distance) equal to about -1 km/s, but no significant expansion term. If a K term is not included in the analysis, a formally significant contraction of the Galaxy is found, about 0.6 km/s/kpc. The radial velocity statistics are incompatible with a continuing mass loss by the galactic center equal to about 100 solar masses per year at a confidence level greater than 99.9 per cent. The statistics are not incompatible with such a mass loss provided that it started less than about 10 million years ago. The statistics are not incompatible with van Flandern's (1975) result for the variation of the constant of gravitation.
Byl John
Ovenden Michael W.
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