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Dorado is a nearby (17.69 Mpc) strongly evolving galaxy group in the SouthernHemisphere. We are investigating the star formation in this group. This paperprovides a FUV imaging of NGC 1533, IC 2038 and IC 2039, which form asubstructure, south west of the Dorado group barycentre. FUV CaF2-1UVIT-Astrosat images enrich our knowledge of the system provided by GALEX. Inconjunction with deep optical wide-field, narrow-band Halpha and 21-cm radioimages we search for signatures of the interaction mechanisms looking in theFUV morphologies and derive the star formation rate. The shape of the FUVluminosity profile suggests the presence of a disk in all three galaxies. FUVemission is detected out to the optical size for IC 2038, and in compactstructures corresponding to Halpha and HII bright features in NGC 1533. A faintFUV emission, without an optical counterpart, reminiscent of the HI structurethat surrounds the outskirts of NGC 1533 and extends up to IC 2038/2039, isrevealed above the local background noise.

Dorado and its member galaxies II. A UVIT picture of the NGC 1533 substructure