Possibly interacting Vorontsov-Vel'yaminov galaxies - I. Observations of VV 432, VV 543 and VV 747

Among the galaxies which were included in the Atlas and Catalogue of Intera cting galaxies by Vorontsov-Vel'yaminov thereafter VV) as multiple systems ("nests", "chains" and similarly looking systems), there are many objects, where the interaction is not evident. Some of them are single objects, incl uding low-mass galaxies with active star formation (SF). In this work we pr esent the description of observations and results of the long-slit spectrop hotometry with the Russian 6 m telescope of three VV-galaxies looking like double or multiple systems, and HI observations of one of them in order to elucidate their nature, determine their metallicity, kinematic properties a nd the evolution status. Galaxies VV 432 and VV 747 are found to be dwarf s ystems with low oxygen abundance (O/H approximate to 1/22 and 1/12 of the s olar value, respectively). Their velocity curves indicate quite slow rotati on with respective maximum velocities of about 60 and 80 km s(-1), in agree ment with their low luminosities. The distance to VV 432 is rather uncertai n. If it is a member of Virgo Cluster, this is the most metal-deficient kno wn galaxy of this aggregate. For galaxy VV 543 the measured emission-line r edshift 0.047 appeared ten times larger than it was given in the original p aper and is cited in databases. This "system" evidently represents an optic al pair of two galaxies with large velocity difference. The fainter western component is an HII-galaxy, while the brighter one is an absorption-line e arly-type galaxy with the radial velocity being 1600 km s(-1) lower.