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We present the results of our investigation on the phenomenon of masssegregation in young star clusters in the Magellanic Clouds. HST/WFPC2observations on NGC 1818, NGC 2004 & NGC 2100 in the Large Magellanic Cloud andNGC 330 in the Small Magellanic Cloud have been used for the application ofdiagnostic tools for mass segregation: i) the radial density profiles of theclusters for various mass groups and ii) their mass functions (MFs) at variousradii around their centres. All four clusters are found to be mass segregated,but each one in a different manner. Specifically not all the clusters in thesample show the same dependence of their density profiles on the selectedmagnitude range, with NGC 1818 giving evidence of a strong such relation andNGC 330 showing only a hint of the phenomenon. NGC 2004 did not also show anysignificant signature of mass segregation in its density profiles. The MFsradial dependence provides clear proof of the phenomenon for NGC 1818, NGC 2100and NGC 2004, while for NGC 330 it gives only indications. An investigation onthe constraints introduced by the application of both diagnostic tools ispresented. We also discuss the problems related to the construction of areliable MF for a cluster and their impact on the investigation of thephenomenon of mass segregation. We find that the MFs of these clusters as theywere constructed with two methods, are comparable to Salpeter's IMF. Adiscussion is given on the dynamical status of the clusters and a test isapplied on the equipartition among several mass groups in them. Both showedthat the observed mass segregation in the clusters is of primordial nature.Comment: A&A Accepted, 20 pages, 9 Figures, Version with language errors and  typos correcte

Mass segregation in young Magellanic Cloud star clusters: Four clusters observed with HST