Odessa Astronomical Publications (Dec 2010)

POSITIVE AND NEGATIVE SUPERHUMPS OF THE DWARF NOVA MN DRA

  • D. A. Samsonov,
  • E. P. Pavlenko,
  • M. V. Andreev,
  • A. Sklyanov,
  • A. M. Zubareva,
  • I. B. Voloshina,
  • V. G. Metlov,
  • S. Yu. Shugarov,
  • A. V. Golovin,
  • O. I. Antoniuk

DOI
https://doi.org/10.18524/1810-4215.2010.23.85241
Journal volume & issue
Vol. 23, no. 0
pp. 98 – 100

Abstract

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We present the result of O–C analysis of the dwarf nova MN Dra. It is based on the multi-site photometric observations that were made over 77 nights in August – November, 2009. The total exposure was 433 hours. During this time binary underwent two superoutbursts and five normal outbursts. In superoutbursts the positive superhumps decreased with extremely large P = -(3 - 8) x 10-4 for SU UMa-like dwarf novae, confirming the known behavior of MN Dra in 2003. MN Dra displayed large-amplitude (up to 1.4m in quiescence and 0.1m–0.2m in normal outbursts) negative superhumps. The improved value of negative superhump period is 0.095952(4) d.