SIMBAD references

We present photometric and spectroscopic observations of the system ESO 296-IG11, which is composed of two galaxies, as well as observations of a small galaxy 1'.3 distant. Colors through the entire system show little variation and reflect the presence of about the same young stellar composition. The quite blue colors of the observed regions in both galaxies of the system indicate star formation activity, and the distribution of the regions through the bodies of the galaxies suggests that a quite generalized starburst has taken place. The spectra of these regions are characteristic of H II regions of comparatively high excitation; their oxygen and nitrogen abundances are low, and their N(N)/N(O) ratios are comparable to those of the Magellanic Clouds and late spiral galaxies. The low abundances of the regions would be consistent with the ages derived for the bursts of star formation in their interiors. The high equivalent widths of the Hα+[N II] emission lines of the integrated spectra of both galaxies indicate enhanced star formation rates compared with isolated galaxies and are compatible with those observed in mergers of two disk galaxies. The velocities indicate that the two galaxies are a physical pair and that they are linked with the small nearby galaxy. The derived information suggests that ESO 296-IG11 is composed of two advanced late-type galaxies with similar general properties, which, together with the small nearby galaxy, constitute a triple system.