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CONTEXT: Many massive stars have nearby companions whose presence hampertheir characterization through spectroscopy. AIMS: We want to obtain spatiallyresolved spectroscopy of close massive visual binaries to derive their spectraltypes. METHODS: We obtain a large number of short long-slit spectroscopicexposures of five close binaries under good seeing conditions, select thosewith the best characteristics, extract the spectra using multiple-profilefitting, and combine the results to derive spatially separated spectra.RESULTS: We demonstrate the usefulness of Lucky Spectroscopy by presenting thespatially resolved spectra of the components of each system, in two cases withseparations of only ~0.3". Those are delta Ori Aa+Ab (resolved in the opticalfor the first time) and sigma Ori AaAb+B (first time ever resolved). We alsospatially resolve 15 Mon AaAb+B, zeta Ori AaAb+B (both previously resolved withGOSSS, the Galactic O-Star Spectroscopic Survey), and eta Ori AaAb+B, a systemwith two spectroscopic B+B binaries and a fifth visual component. The systemshave in common that they are composed of an inner pair of slow rotators orbitedby one or more fast rotators, a characteristic that could have consequences forthe theories of massive star formation.

astronomy and astrophysics

Lucky Spectroscopy, an equivalent technique to Lucky Imaging. Spatially  resolved spectroscopy of massive close visual binaries using the William  Herschel Telescope