Features of the orbital variability in the brightness of the WZ Sge type dwarf nova V1108 Her |
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Authors: | E P Pavlenko T Kato O I Antonyuk A Imada R Ishioka H Maehara |
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Institution: | (1) Suffolk, UK |
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Abstract: | Results are presented from photometric studies of the dwarf nova V1108 Her conducted at the primary focus of the 2.6-m G.
A. Shajn Telescope at the Crimean Astrophysical Observatory during June-July 2008, 4 years after the 2004 outburst. An orbital
period of 0.05672(4) days is found for the system. An analysis of observations made earlier during the 2004 outburst reveals
an orbital signal which indicates that V1108 Her is an eclipsing system. The mass ratio of the secondary component to the
white dwarf is estimated to be q = 0.068, which makes it highly likely that the secondary component of this system is a brown dwarf. The orbital light curves
indicate a complex structure for the accretion disk whose radius has reached a 2:1 resonance. An explanation is suggested
for a quasi-periodic modulation in the brightness at 1/4 of the orbital period observed in V1108 Her and other WZ Sge systems. |
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