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CS Indi: SU UMa-type dwarf nova with long precursor outburst

CS Indi: SU UMa-type dwarf nova with long precursor outburst

We observed the 2018 November outburst of CS Ind and confirmed that it was a genuine superoutburst with a very long [0.12471(1) d in average] superhump period. The superoutburst was preceded by a long precursor, which was recorded first time in SU UMa-type dwarf novae. We interpret that the combination …