Structural parameters and integrated magnitudes of globular star clusters

Astronomy and Astrophysics – Astronomy

Scientific paper

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Globular Clusters, Star Clusters, Stellar Magnitude, Astronomical Catalogs, Radii, Sky Surveys (Astronomy), Structural Analysis

Scientific paper

An atlas of integrated-stellar-magnitude diagrams for 108 globular star clusters is compiled on the basis of all existing photoelectric observations of integrated cluster magnitudes performed with a circular aperture and reduced to a single system. The diagrams describe the magnitude variation with increasing aperture size. Central and tidal radii, density parameters, and integrated magnitudes are determined by fitting curves obtained according to King's (1966) model to the diagram; these curves reflect the integrated-magnitude variation with distance from the cluster center. Composite data on structural parameters and integrated magnitudes are obtained for 128 globular clusters by taking into account published results that contain cluster diameter and magnitude determinations and including measurements of cluster diameters on Palomar Sky Survey prints.

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