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GALEX AND OPTICAL OBSERVATIONS OF GW LIBRAE DURING THE LONG DECLINE FROM SUPEROUTBURST*

机译:爆发超长下降后GW天秤座的光学和光学观测*

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The prototype of accreting, pulsating white dwarfs (GW Lib) underwent a large amplitude dwarf nova outburst in 2007. We used ultraviolet data from Galaxy Evolution Explorer and ground-based optical photometry and spectroscopy to follow GW Lib for three years following this outburst. Several variations are apparent during this interval. The optical shows a superhump modulation in the months following outburst, while a 19 minute quasi-periodic modulation lasting for several months is apparent in the year after outburst. A long timescale (about 4 hr) modulation first appears in the UV a year after outburst and increases in amplitude in the following years. This variation also appears in the optical two years after outburst but is not in phase with the UV. The pre-outburst pulsations are not yet visible after three years, likely indicating the white dwarf has not returned to its quiescent state.
机译:增生,脉动的白矮星(GW Lib)的原型在2007年经历了一次大幅度的矮新星爆发。在这次爆发之后,我们使用了来自Galaxy Evolution Explorer的紫外线数据以及地面光学光度法和光谱学来跟踪GW Lib了三年。在此间隔内,会有几种变化。光学显示在爆发后的几个月中出现了超驼峰调制,而在爆发后的一年中,持续了几个月的19分钟准周期调制很明显。爆发后一年,长时标(约4小时)调制首先出现在紫外线中,随后几年振幅增加。这种变化也出现在爆发后的两年光学中,但与紫外线不同相。三年后仍未看到爆发前的脉动,这可能表明白矮星尚未恢复到静止状态。
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