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Superhump and outburst activity of the cataclysmic variable RZ LMi in the $$- and optical passbands
Authors:S Y Shugarov  N A Katysheva  D Chochol  V N Krushevska  O V Vozyakova
Institution:1.Astronomical Institute of Slovak Academy of Sciences,Tatranska Lomnica,Slovakia;2.Sternberg Astronomical Institute,M.V. Lomonosov Moscow State University,Moscow,Russia;3.Main Astronomical Observatory,National Academy of Sciences of Ukraine,Kyiv,Ukraine
Abstract: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 \(+0.1\mbox{--}{+}0.2\) 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.
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