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We present deep surface photometry of a volume--limited sample of 21 UMemission line galaxies in broadband optical UBVRI and near infra-red (NIR) HKsfilters. The sample comprises 19 blue compact galaxies (BCGs) and two spirals.For some targets the exposure times are the deepest to date. For the BCG UM462we observe a previously undetected second disk component beyond a surfacebrightness level of mu_B=26 mag arcsec^{-2}. This is a true low surfacebrightness component with central surface brightness mu_0=24.1 mag arcsec^{-2}and scale length h_r=1.5 kpc. All BCGs are dwarfs, with M_B>=-18, and verycompact, with an average scale length of h_r~1 kpc. We separate the burst andhost populations for each galaxy and compare them to stellar evolutionarymodels with and without nebular emission contribution. We also measure theA_{180} asymmetry in all filters and detect a shift from optical to NIR in theaverage asymmetry of the sample. This shift seems to be correlated with themorphological class of the BCGs. Using the color-asymmetry relation, weidentify five BCGs in the sample as mergers, which is confirmed by theirmorphological class. Though clearly separated from normal galaxies in theconcentration-asymmetry parameter space, we find that it is not possible todistinguish luminous starbursting BCGs from the merely star forming lowluminosity BCGs.

Deep multiband surface photometry on star forming galaxies: II. A volume limited sample of 21 emission lines galaxies