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We present the results of our investigation of the intermediate-age starcluster BS 90, located in the vicinity of the HII region N 66 in the SMC,observed with HST/ACS. The high-resolution data provide a unique opportunityfor a very detailed photometric study performed on one of the rareintermediate-age rich SMC clusters. The complete set of observations iscentered on the association NGC 346 and contains almost 100,000 stars down to V~28 mag. In this study we focus on the northern part of the region, whichcovers almost the whole stellar content of BS 90. We construct its stellarsurface density profile and derive structural parameters. Isochrone fits on theCMD of the cluster results in an age of about 4.5 Gyr. The luminosity functionis constructed and the present-day mass function of BS 90 has been obtainedusing the mass-luminosity relation, derived from the isochrone models. We founda slope between -1.30 and -0.95, comparable or somewhat shallower than atypical Salpeter IMF. Examination of the radial dependence of the mass functionshows a steeper slope at larger radial distances, indicating mass segregationin the cluster. The derived half-mass relaxation time of 0.95 Gyr suggests thatthe cluster is mass segregated due to its dynamical evolution. From theisochrone model fits we derive a metallicity for BS 90 of [Fe/H]=-0.72, whichadds an important point to the age-metallicity relation of the SMC. We discussour findings on this relation in comparison to other SMC clusters.

astrophysical journal/the astrophysical journal

The Star-forming Region NGC 346 in the Small Magellanic Cloud with  Hubble Space Telescope ACS Observations. II. Photometric Study of the  Intermediate-Age Star Cluster BS 90