PTF1 J071912 .13+485834.0：一个由天气调查发现的爆发性AM CVn系统
PTF1 J071912.13+485834.0: An outbursting AM CVn system discovered by a synoptic survey
摘要：
我们提出了广泛的光度和光谱观测PTF 1 J071912.13+485834.0，爆发AM CVn系统发现的帕洛玛瞬态工厂（PTF）。AM CVn系统是一些已知最小间距的恒星联星，轨道周期范围为5至65分钟。它们被认为是由一个白矮星吸积体和一个（半）简并的富氦施主组成，被认为是激变变星的氦等价物。我们已经通过光谱和光度测定确定了PTF 1 J071912.13+485834.0的轨道周期为26.77 \pm 0.02分钟，并发现了一个大于65天的超级爆发复发时间以及“正常”爆发的存在-在AM CVn系统中很少看到，但在超级爆发的灾难变星中是众所周知的。我们提出了一个长期的光变曲线超过两个超周期，以及高节奏测光的爆发和静止阶段，这两者都表现出明显的变化。我们还比较了PTF 1 J071912.13+485834.0的爆发和静止光谱与其他已知的AM CVn系统，并使用静止相位分辨光谱来确定光度变化的起源。最后，我们绘制了不同子类的SU UMa型激变变星和爆发AM CVn系统之间的相似之处。我们的结论是预测，帕洛玛瞬态工厂可能会增加一倍以上的数量爆发AM CVn系统已知的，这将大大增加我们的了解AM CVn系统。
英文摘要：
We present extensive photometric and spectroscopic observations of PTF1 J071912.13+485834.0, an outbursting AM CVn system discovered by the Palomar Transient Factory (PTF). AM CVn systems are stellar binaries with some of the smallest separations known and orbital periods ranging from 5 to 65 minutes. They are believed to be composed of a white dwarf accretor and a (semi)-degenerate He-rich donor and are considered to be the helium equivalents of Cataclysmic Variables. We have spectroscopically and photometrically identified an orbital period of 26.77 \pm 0.02 minutes for PTF1 J071912.13+485834.0 and found a super-outburst recurrence time of greater than 65 days along with the presence of "normal" outbursts - rarely seen in AM CVn systems but well known in super-outbursting Cataclysmic Variables. We present a long-term light curve over two super-cycles as well as high cadence photometry of both outburst and quiescent stages, both of which show clear variability. We also compare both the outburst and quiescent spectra of PTF1 J071912.13+485834.0 to other known AM CVn systems, and use the quiescent phase-resolved spectroscopy to determine the origin of the photometric variability. Finally, we draw parallels between the different subclasses of SU UMa-type Cataclysmic Variables and outbursting AM CVn systems. We conclude by predicting that the Palomar Transient Factory may more than double the number of outbursting AM CVn systems known, which would greatly increase our understanding of AM CVn systems.
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