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

Authors

  • D. Chochol Astronomical Institute of the Slovak Academy of Sciences, 059 60 Tatranská Lomnica, Slovakia
  • S. Shugarov Astronomical Institute of the Slovak Academy of Sciences, 059 60 Tatransk´a Lomnica, Slovakia Sternberg Astronomical Institute of the Moscow State University, Russia
  • N. Katysheva Sternberg Astronomical Institute of the Moscow State University, Russia
  • I. Volkov Sternberg Astronomical Institute of the Moscow State University, Russia
  • A. Zharova Sternberg Astronomical Institute of the Moscow State University, Russia
  • E. Pavlenko Crimean Astrophysical Observatory, Nauchny, Ukraine
  • N. Pit Crimean Astrophysical Observatory, Nauchny, Ukraine
  • R. Zvagelsky Crimean Astrophysical Observatory, Nauchny, Ukraine
  • O. Antoniuk Crimean Astrophysical Observatory, Nauchny, Ukraine
  • A. Baklanov Crimean Astrophysical Observatory, Nauchny, Ukraine
  • N. Borisov Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhnij Arkhyz
  • M. Gabdeev Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhnij Arkhyz

DOI:

https://doi.org/10.14311/APP.2015.02.0165

Abstract

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 emission
lines of H I and He I from accretion disk, so the dwarf nova is in a late stage of stellar evolution.

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Published

2015-02-23

Issue

Vol. 2 No. 1 (2015): THE GOLDEN AGE OF CATACLYSMIC VARIABLES AND RELATED OBJECTS - II

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