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We present our photometric study of the stellar association NGC 602 in thewing of the Small Magellanic Cloud (SMC). The data were taken in the filtersF555W and F814W using the Advanced Camera for Surveys (ACS) on-board the HubbleSpace Telescope (HST). Photometry was performed using the ACS module of thestellar photometry package DOLPHOT. We detected more than 5,500 stars with amagnitude range of 14 \lsim m_{555} \lsim 28 mag. Three prominent stellarconcentrations are identified with star counts in the observed field, theassociation NGC 602 itself, and two clusters, one of them not being currentlyin any known catalog. The Color-Magnitude Diagrams (CMDs) of both clusters showfeatures typical for young open clusters, while that of the association revealsbright main sequence (MS) and faint pre-main sequence (PMS) stars as themembers of the system. We construct the initial mass spectrum (IMS) of theassociation by applying an age-independent method of counting the PMS starswithin evolutionary tracks, while for the bright MS stars we transform theirmagnitudes to masses with the use of mass-luminosity relations. The IMS of NGC602 is found to be well represented by a single-power law, corresponding to anInitial Mass Function (IMF) of slope \Gamma\approx -1.2 for 1 \lsim M/M{\solar}\lsim 45. This indicates that the shape of the IMF of a star forming system inthe SMC for stars with masses higher than 1 M{\solar} seems to be quite similarto the field IMF in the solar neighborhood.

The Initial Mass Function of the Stellar Association NGC 602 in the Small Magellanic Cloud with Hubble Space Telescope ACS Observations