Multiband analysis of a sample of blue compact dwarf galaxies. II. Spatially resolved and integrated photometry

This is the second in a series of papers devoted to the study of a sample o f 28 blue compact dwarf galaxies (BCDs). In the first paper, we presented t he broadband observations in B, V, R, and I. Deep contour maps, surface-bri ghtness profiles, and color profiles were used to analyze and discuss their morphology and structure. Here, we present new U-band and H alpha observat ions. We compute isophotal and asymptotic magnitudes of the sample galaxies and total H alpha fluxes. Comparison with previous works is done to assess the quality of the data available for BCDs. Finally, we produce an atlas o f detailed color and H alpha maps, the Drst systematic atlas of this kind p ublished so far. The high quality of the data allows us to identify the dif ferent star-forming knots in the maps and to discriminate between them and the regions where star formation activity has already ceased. We supplement the atlas with a morphological description of each galaxy and group the ga laxies in four classes according to the distribution of their star-forming regions.