Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....42..109w&link_type=abstract
Astronomy and Astrophysics, vol. 42, no. 1, Aug. 1975, p. 109-118.
Astronomy and Astrophysics
Astrophysics
105
Galactic Structure, Globular Clusters, Halos, Spatial Distribution, Astronomical Photometry, Cepheid Variables, Galactic Nuclei, Galactic Radiation, Metals, Tables (Data), Ubv Spectra
Scientific paper
The distribution of globular clusters is studied. Individual distances are redetermined on the basis of available data and an adopted apparent magnitude of +0.6 for RR Lyrae stars. Both metal-poor (H) and comparatively metal-rich (D) clusters appear to have an essentially spherical distribution with the D clusters concentrated close to the galactic center except for a few cases. Kinematic data are consistent with the spatial density distributions if a circular-velocity value for the local standard of rest of 200 to 225 km/s is adopted (for a solar distance from the galactic center of 9 kpc). The mass density in the globular-cluster system declines sharply beyond 20 kpc from the center. Estimates of the mass of the halo are made. While it is quite possible that the mass of the halo exceeds that of the disk, there is no evidence that the mass of the galaxy exceeds previous estimates by a substantial amount.
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