Features of the orbital variability in the brightness of the WZ Sge type dwarf nova V1108 Her

Features of the orbital variability in the brightness of the WZ Sge type dwarf nova V1108 Her
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WZ Sge型矮新星V1108 Her亮度轨道变化特征

DOI:
10.1007/s10511-011-9199-0
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发表时间:
2011
期刊:
影响因子:
0.5
通讯作者:
et al
et al
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Pavlenko;E.P.; Kato;T.; Antonyuk;O.I.; Imada;A.; Ishioka;R.;et al

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本文介绍了在2.6 m G的主焦点上对矮新星V1108 Her进行的光度学研究的结果。A. 2008年6月至7月期间,克里米亚天体物理观测站的Shajn望远镜,2004年爆发后4年。该系统的轨道周期为0.05672(4)天。对2004年爆发期间早期观测的分析揭示了一个轨道信号,表明V1108 Her是一个食系统。次级成分与白色矮星的质量比估计为beq= 0.068,这使得该系统的次级成分极有可能是棕矮星。轨道光变曲线表明吸积盘的复杂结构,其半径已达到2:1共振。本文对V1108 Her和其它WZ Sge系统中观测到的1/4轨道周期亮度的准周期调制现象提出了解释。
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 beq= 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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