Collapsed cores and the structural parameters of old Large Magellanic Cloud star clusters

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Astronomical Photometry, Gravitational Collapse, Magellanic Clouds, Star Clusters, Stellar Structure, Globular Clusters, Open Clusters, Stellar Evolution, Stellar Luminosity, Ubv Spectra

Scientific paper

New CCD aperture photometry of 10 old massive LMC clusters is presented. These data have been combined with previously published results for four other old LMC clusters. The clusters were chosen on the basis of a photometric age index in order to isolate (albeit crudely) the oldest massive stellar systems in the LMC. The analysis of the surface photometry of the clusters in this sample of old objects has revealed: (1) most of the clusters can be satisfactorily fitted to standard, single-mass King profiles; (2) two clusters, NGC 2005 and NGC 2019, do not have surface brightness profiles which can be fitted to King models, and, on the basis of this result and comparisons with 'collapsed' Galactic globular clusters, these two objects appear to be examples of collapsed LMC cluster cores; and (3) the most concentrated clusters are all located near the LMC center, whereas only more open clusters are found in the outer LMC.

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