Physics
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992ipesprept.....b&link_type=abstract
M.S. Thesis Instituto de Pesquisas Espaciais, Sao Jose dos Campos (Brazil).
Physics
Displacement, Galactic Clusters, Globular Clusters, Sampling, Azimuth, Binomial Coefficients, Centroids, Errors, Symmetry
Scientific paper
An up-to-date sample of 134 globular clusters with an error in magnitude of 0m.40 was used to test a new model of estimation for the distance to the Galactic Center. The model is based upon a diagnosis of the selection effects in the local azimuthal distribution of clusters in order to redistribute them systematically around candidates to the center of symmetry of the system. The procedure tests subsamples of clusters of different spatial extent and uses the mean, the medium, and an average value weighted by binomial coefficients to estimate separately the displacement of the centroid in the altered systems. For each subsample the candidate with the smallest modulation of its mean joint displacement with the associated scatter is selected, and it is concluded from an analysis of weighted means that the most consistent result favors an estimate of Ro = 6.90 +/- 0.33 kpc.
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