measurements of H$\alpha$ and \[N II\] lines is given in Fig.4b. As one can see, the rotation curve of the forming ring represents almost a straight line (see also Fig.6). The slope of the rotation curve is equal to 13 km/s/arcsec or 29 km/s/kpc, the maximum velocity is close to that observed in the main galaxy (Fig.6) (such a feature is typical for “classic” PRGs). The straight character probably suggests that a relatively narrow ring has been formed in circumpolar plane of the galaxy. The possibility of forming such ring structures accumulating the part of accreting matter has been shown by Weil & Hernquist (1993) and Sotnikova (1996) in course of numerical simulations. The gas of the ring interacting with that of the galaxy disk settles on it. On the other hand there is a permanent supply of the ring with the matter transfered from NGC 3808A. Stopping of accretion seems to result in prompt disappearence of the ring.

The maximum observed rotational velocity in the forming ring (as well as in the main body of the galaxy) is approximately equal to 120 km/s. Its total (after account for all parts twined around NGC 3808B) observed absolute luminosity is $M_{V}\,\approx\rm\,-18$ 