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The LMC Cluster Hodge 11

Hodge 11 (= SL 868) is a red, globular-like cluster (V ≅ 12.1, B—V = 0.62), situated on the east side of the LMC about 5 kpc projected distance from its centre (Gascoigne 1966). It was included in a programme to study the chemical evolution of the LMC by determining ages and metal abundances for a number of its clusters. Figure 1 shows a preliminary colour-magnitude diagram, found from four AAT plates calibrated with the AAT two-channel photometer. The choice of the radius, 1′.37 (23 pc), within which the stars were measured, was guided by the surface photometry of the cluster described later (Figure 3). But while it makes the number of “clean” stars inside the radius rather small, those outside it are too unlikely to be cluster members. As yet the calibration extends only to V = 19.6, and the nature of the cluster cannot be determined unambiguously. But Figure 1 already shows an unusual feature, in the very blue colour of the group of stars at V ≅ 19, B—V = 0.60, which on the usual interpretation would point to a metal abundance possibly lower than any yet encountered.