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Similarities of the intermediate-age SMC star cluster NGC 152 with inner disk clusters in the Milky Way

  • T. Richtler (a1), Klaas S. De Boer (a1), A. Vallenari (a1) and W. Seggewiss (a1)

Abstract

A colour-magnitude diagram (CMD) of the region containing the intermediate-age SMC globular cluster NGC 152 was published recently (Melcher & Richtler 1989). A particularly interesting feature of this CMD is the “clump” of He-core burning stars, which are predominantly field stars. A selection of stars near the cluster centre leads to the CMD shown in Figure 1. The vertical extension of the clump (explainable by the evolution of stars younger than 1 Gyr) is replaced by a “tilted horizontal branch” (we use this expression for lack of a better one). The age of NGC 152 is about 1.3 Gyr and the reddening is small; the metallicity is unknown but less than −0.6 dex, which is the mean metallicity of the young SMC population. The tilted HB can be reproduced in CMD simulations using the method developed by Vallenari et al. (1990), and thus can be considered as a normal feature of star clusters like NGC 152. It is evident also in other intermediate-age MC clusters like Kron 3 (Rich et al. 1984).

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References

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Similarities of the intermediate-age SMC star cluster NGC 152 with inner disk clusters in the Milky Way

  • T. Richtler (a1), Klaas S. De Boer (a1), A. Vallenari (a1) and W. Seggewiss (a1)

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