Superhump and outburst activity of the cataclysmic variable RZ LMi in the U - and optical passbands

An analysis of the new U, B, V, R-C, I-C-photometry of the cataclysmic variable RZ LMi obtained in 2016-17 showed the largest (U - B) colour excess in quiescence as well as during the decline of brightness, associated with the outbursts activity. The smallest (U - B) colour excess was found during the brightness increase from the quiescence. In contrast to the (U - B) colour index, the (B - V), (V - R-C), (R-C - I-C) colour indices exhibits the largest colour excesses near the maximum of the outburst and the smallest during the quiescence. The (B - V) colour index showed also a large excess 1-2 days before a minimum. The detailed study of superhumps during the maximum of activity reveals the largest (U - B) colour excess at the time of the minimum brightness of superhumps. The (B - R-C) colour index exhibits a similar behaviour, but with a phase shift of +0.1-+0.2 period of superhumps. The tracks in two-colour and colour-magnitude diagrams during superoutbursts are compared with the data for other cataclysmic variables during their outbursts as well as with published theoretical calculations.