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We have obtained near-infrared images and spectra of three blue compact dwarfgalaxies of intermediate sub-solar metallicity Tol~35, Tol~3 and UM 462. Thiswork is part of a larger project aimed to study the star formation and thestellar populations of low metallicity galaxies in the near-infrared. In thisframe work galaxies of intermediate metallicity represent an important step inunderstanding the most extreme cases filling the gap between solar and very lowmetallicity galaxies. We have observed HII region like spectra in all threegalaxies; in all cases the star formation episodes are only a few Myr old.Consistently with a young age our spectra show no evidence for stellarabsorption features typical of supergiants, nor of [FeII] emission typical ofsupernovae. The K-band gas fraction ranges from 20 to 40 % showing that gasemission can significantly contaminate broadband near-infrared colors in youngmetal-poor starbursts. We have detected molecular hydrogen in emission in allthree objects. All sources show bright knots superimposed on a lower surfacebrighness envelope. The knots are identified with Super Star Clusters; six ofthem are present in UM 462. In all galaxies we detect the presence of an oldstellar population.Comment: 10 pages, 10 figure

Near-infrared properties of Blue Compact Dwarf Galaxies: The link between solar and low metallicity