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PERIOD VARIATIONS OF SUPERHUMPS IN SU UMA STARS
IMADA, AKIRA,KATO, TAICHI The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
We review recent results on superhump period variations in SU UMa-type dwarf novae. Our statistical studies have revealed that the evolution of the superhump period is basically composed of three stages: stage-A, during which the superhump period is long and constant, stage-B, during which the superhump period increases as the superoutburst proceeds, and stage-C, during which the superhump period is short and constant. We also introduce a new method of estimating a mass ratio using the stage-A superhump period. This method can extend to, for example, low mass X-ray binaries or AM CVn stars if the stage-A superhump period is well determined.