Research School of Astronomy and Astrophysics, Institute of Advanced Studies, The Australian National University

We have carried out Wide Field Planetary Camera 2 F160BW, F555W and F656N imaging of four young populous clusters: NGC 330 in the Small Magellanic Cloud and NGC 1818, NGC 2004 and NGC 2100 in the Large Magellanic Cloud. We report photometric results for these four clusters, including identification using photometric colours of the cluster Be star population. We present theoretical WFPC2 and broad band colours and bolometric corrections for LMC and SMC metallicities. The use of the far-UV F160BW filter enables accurate determination of the effective temperatures for stars in the vicinity of the main sequence turnoff and on the unevolved main sequence.

Attention is drawn to the high fraction of Be stars in the vicinity of the main sequence turnoff seen within each cluster. Implications of this finding are discussed.

2000, AJ, 119, 1748