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Structure of Globular Clusters

Published online by Cambridge University Press:  14 August 2015

G. Meylan
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching bei München, Germany
G.A. Drukier
Affiliation:
Dept. of Astronomy, Indiana University, 319 Swain West, Bloomington, IN, 47401, USA

Extract

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There was a time, more than a century ago, when Astronomy & Astrophysics was not a European Journal yet, but still an American one. In its Vol. XII, Bailey (1893) published, from photographic observations of two globular clusters (GCs), ω Centauri and 47 Tucanae, what were probably the first extensive star counts, which represent the oldest observational constraint for the study of the structure of GCs. Bailey’s counts, together with some new material concerning other clusters were used by Pickering (1897) in the first important comparisons between observed and theoretical profiles in order to study the radial distribution of stars in clusters.