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(Abridged) We have performed a comprehensive multiwavelength analysis of asample of 20 starburst galaxies that show the presence of a substantialpopulation of massive stars. The main aims are the study of the massive starformation and stellar populations in these galaxies, and the role thatinteractions with or between dwarf galaxies and/or low surface companionobjects have in triggering the bursts. We completed new deep optical and \NIR\broad-band images, as well as the new continuum-subtracted H$\alpha$ maps, ofour sample of Wolf-Rayet galaxies. We analyze the morphology of each system andits surroundings and quantify the photometric properties of all importantobjects. All data were corrected for both extinction and nebular emission usingour spectroscopic data. The age of the most recent star-formation burst isestimated and compared with the age of the underlying older low-luminositypopulation. The \Ha-based star-formation rate, number of O7V equivalent stars,mass of ionized gas, and mass of the ionizing star cluster are also derived. Wefound interaction features in many (15 up to 20) of the analyzed objects, whichwere extremely evident in the majority. We checked that the correction fornebular emission to the broad-band filter fluxes is important in compactobjects and/or with intense nebular emission to obtain realistic colors andcompare with the predictions of evolutionary synthesis models. The estimate ofthe age of the most recent star-formation burst is derived consistently. Withrespect to the results found in individual objects, we remark the strong \Ha\emission found in IRAS 08208+2816, UM 420, and SBS 0948+532, the detection of adouble-nucleus in SBS 0926+606A, a possible galactic wind in Tol 9, and one(two?) nearby dwarf star-forming galaxies surrounding Tol 1457-437.

Massive star formation in Wolf-Rayet galaxies: I. Optical and NIR photometric results