HST/FOS spatially resolved spectral classification of compact OB groups inthe Large Magellanic Cloud

Blue-violet spectrograms of individual components in four compact OB groups of the Large Magellanic Cloud, obtained with the Hubble Space Telescope (H ST) Faint Object Spectrograph (FOS), are presented and discussed. Two of th e massive multiple systems are in the 30 Doradus periphery, while the other two represent the core and the peripheral, triggered associations in the g iant shell H II region Henize N11. Uncontaminated spectrograms of three Wol f-Rayet and two very early Of components have been obtained for the first t ime; they can be observed only as composites with their close companions fr om the ground. Many of the companions have also been observed separately wi th the HST FOS, and several are of special interest in their own right. The se observations provide information on the initial masses and ages of the p eculiar objects, and on the evolutionary relationships among different spec tral categories within the presumably coeval systems.