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We present a study of the LMC compact HII region N11A using Hubble SpaceTelescope imaging observations which resolve N11A and reveal its unknownnebular and stellar features. The presence of a sharp ionization frontextending over more than 4'' (1 pc) and fine structure filaments as well aslarger loops indicate an environment typical of massive star formation regions,in agreement with high [OIII]/Hb line ratios. N11A is a young region, asdeduced from its morphology, reddening, and especially high local concentrationof dust, as indicated by the Balmer decrement map. Our observations also reveala cluster of stars lying towards the central part of N11A. Five of the starsare packed in an area less than 2'' (0.5 pc), with the most luminous one beinga mid O type star. N11A appears to be the most evolved compact HII region inthe Magellanic Clouds so far studied.

$\vec {HST}$ observations of the LMC compact H II region N 11A