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CONTEXT. Many massive stars have nearby companions whose presence hampertheir characterization through spectroscopy. AIMS. We want to continueobtaining spatially resolved spectroscopy of close massive visual binaries toderive their spectral types. METHODS. We have used lucky spectroscopy to obtainmany short long-slit spectroscopic exposures of 19 close visual binaries undergood seeing conditions. We selected those with the best characteristics,extracted the spectra using multiple-profile fitting, and combined the resultsto derive spatially separated spectra. The results are analyzed in combinationwith data from lucky imaging, regular intermediate-resolution single-orderspectroscopy, and \'echelle high-resolution spectroscopy. RESULTS. The newapplication of lucky spectroscopy has allowed us to [a] spatially disentanglefor the first time two O stars (FN CMa B and 6 Cas B) with brighter BAsupergiant companions; [b] determine that two B stars (alpha Sco B and HD164492 B) with close and more massive companions are fast rotators; [c] extendthe technique to cases with extreme magnitude differences, shorter separations,and fainter primary magnitudes down to B=11; [d] spatially disentangle thespectra of stars with companions as diverse as an A supergiant (6 Cas A), a WRstar (WR 157), and an M supergiant (alpha Sco A); [e] discover the unexpectedidentity of some targets such as two previously unknown bright O stars (HD51756 B and BD +60 544) and a new member of the rare OC category (HD 8768 A);and [f] identify and classify which of the components of four visual binariesis a double-lined spectroscopic binary and for another seven systems detectsigns of spectroscopic binarity using high-spectral-resolution spectroscopy. Wealso present a determination of the limits of the technique. [ABRIDGED]

astronomy and astrophysics

Lucky spectroscopy, an equivalent technique to Lucky Imaging: II.  Spatially-resolved intermediate-resolution blue-violet spectroscopy of 19  close massive binaries using the William Herschel Telescope