矮新星EZ Lyncis第二次访问不稳定地带
Dwarf Nova EZ Lyncis Second Visit to Instability Strip
摘要：
对2012- 2014年（2010年爆发后2-3.5年）间隔超过565 d的14个EZ Lyn周期图的分析表明，在100 c/d附近存在稳定信号，在310 c/d、338 c/d和368 c/d附近存在3个信号（对应的周期分别为864 s、279 s、256 s和235 s）。我们将它们解释为EZ Lyn中白矮星的独立非径向脉动，但也不能排除100 c/d频率与轨道周期谐波的线性组合可能产生368 c/d频率的可能性。在不稳定带的第一次停留期间，检测到100 c/d的信号作为瞬态信号。338 c/d的周期是已知的非径向脉动EZ Lyn在2010年爆发后进入不稳定带。我们首次探测到了310 c/d和368 c/d附近的信号。我们首次应用二维最小绝对收缩和选择算子（Lasso）分析来探索这些信号在持续时间为6-12小时的夜间观测的小时尺度上的行为。Lasso分析揭示了所有三个频率的同时存在（310 c/d，338 c/d和368 c/d），但在5-7小时的时间尺度上，振幅和频率的变化幅度为2-6个百分点，最大的漂移相当于5小时内的17.5 s。
英文摘要：
The analysis of 14 periodograms of EZ Lyn for the data spaced over 565 d in 2012--2014 (2-3.5 yr after 2010 outburst) yielded the existence of the stable signals around 100 c/d and three signals around 310 c/d, 338 c/d and 368 c/d (the corresponding periods are 864 s, 279 s, 256 s and 235 s). We interpret them as independent non-radial pulsations of the white dwarf in EZ Lyn, but a possibility that a linear combination of frequency at 100 c/d and harmonic of orbital period could produce the frequency at 368 c/d also cannot be excluded. The signal at 100 c/d was detected during the first stay in the instability strip as a transient one. The period at 338 c/d, is a known non-radial pulsation EZ Lyn entered the instability strip after the 2010 outburst. We detected the signals around 310 c/d and 368 c/d for the first time. We applied the two-dimensional least absolute shrinkage and selection operator (Lasso) analysis for the first time to explore the behavior of these signals on the scale of hours for nightly runs of observations having duration of 6-12 hr. The Lasso analysis revealed the simultaneous existence of all three frequencies (310 c/d, 338 c/d and 368 c/d) for majority of nights of observations, but with variable amplitudes and variable drifts of frequencies by 2-6 percents on a time scale of ~5-7 hr. The largest drift we detected corresponded to 17.5 s in period in ~5 hours.
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