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Dwarf nova EZ Lyncis second visit to instability strip

机译:矮人新星EZ Lyncis第二次访问不稳定带

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The analysis of 14 periodograms of EZ Lyn for data spaced over 565 d in 2012-2014 (2-3.5 yr after the 2010 outburst) yielded the existence of a stable signal around 100 cycles/day (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 nonradial pulsations of the white dwarf in EZ Lyn, but the possibility that a linear combination of a frequency of 100 c/d and a harmonic of the orbital period might produce a frequency of 368 c/d also cannot be excluded. The signal at 100 c/d was detected as a transient during the first stay in the instability strip. The period at 338 c/d has been a known nonradial pulsation since 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 a time scale of hours in nightly runs of observations having a 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) on a majority of nights of observations, but with variable amplitudes and variable drifts of frequencies by 2%-6% on a time scale of 5-7 hr. The largest drift we detected corresponded to 17.5 s in period in similar to 5 hr.
机译:对2012年至2014年(2010年爆发后的2-3.5年)间隔565天以上数据的14个EZ Lyn周期图进行分析,得出稳定信号的存在频率约为100个周期/天(c / d),三个信号存在于310个附近c / d,338 c / d和368 c / d(相应的周期为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,但是也不能排除100 c / d的频率和轨道周期谐波的线性组合可能产生368 c / d的频率的可能性。在不稳定性带中的第一次停留期间,将100 c / d的信号检测为瞬态。自EZ Lyn在2010年爆发后进入不稳定带以来,338 c / d的时间一直是已知的非径向脉动。我们首次检测到310 c / d和368 c / d附近的信号。我们首次应用了二维最小绝对收缩和选择算子(Lasso)分析,以在持续6-12小时的夜间观测中,以小时为单位探索这些信号的行为。 Lasso分析显示,在大多数观察夜晚中,所有三个频率(310 c / d,338 c / d和368 c / d)同时存在,但幅度可变且频率漂移可变2%-6 %的时间范围为5-7小时。我们检测到的最大漂移对应于5小时内的17.5 s。

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