Acta Polytechnica CTU Proceedings (Feb 2015)

Superoutburst of a New Sub-Period-Minimum Dwarf Nova CSS130418 in Hercules

  • D. Chochol,
  • S. Shugarov,
  • N. Katysheva,
  • I. Volkov,
  • A. Zharova,
  • E. Pavlenko,
  • N. Pit,
  • R. Zvagelsky,
  • O. Antoniuk,
  • A. Baklanov,
  • N. Borisov,
  • M. Gabdeev

DOI
https://doi.org/10.14311/APP.2015.02.0165
Journal volume & issue
Vol. 2, no. 1
pp. 165 – 169

Abstract

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Multicolour photometry of a new dwarf nova CSS130418 in Hercules, which underwent superoutburst on April 18, 2013, allow to classified it as a WZ Sge-type dwarf nova. The phase light curves for different stages of superoutburst are presented. The early superhumps were used to determine the orbital period Porb = 64.84(1) minutes, which is shorter than the period minimum ~78 minutes for normal hydrogen-rich cataclysmic variables. We found the mean period of ordinary superhumps Psh = 65.559(1) minutes. The quiescent spectrum is rich in helium, showing double peaked emissionlines of H I and He I from accretion disk, so the dwarf nova is in a late stage of stellar evolution.