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Third-nearest WZ Sge-Type dwarf nova candidate ASASSN-14dx classified on the basis of Gaia Data Release 2

机译:第三次最近的WZ SGE型Dwarf Nova候选ASASSN-14DX根据盖亚数据发布2分类

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ASASSN-14dx showed an extraordinary outburst whose features are a small outburst amplitude (similar to 2.3 mag) and long duration (>4yr). Because we found a long observational gap of 123d before the outburst detection, we propose that the main outburst plateau was missed and that this outburst is just a "fading tail" often seen after the WZ Sge-type super-outbursts. In order to distinguish between WZ Sge and SU UMa-type dwarf novae (DNe), we investigated Gaia Data Release 2 (DR2) statistically. We applied a logistic regression model and succeeded in classifying by using absolute Gaia magnitudes M-G and Gaia colors G(BP)-G(RP). Our new classifier also suggests that ASASSN-14dx is the best candidate of a WZ Sge-type DN. We estimated distances from the Earth of known WZ Sge stars by using Gaia DR2 parallaxes. The result indicates that ASASSN-14dx is the third-nearest WZ Sge star (next to WZ Sge and V455 And), and hence the object can show the third-brightest WZ Sge-type super-outburst whose maximum is V= 8-9 mag.
机译:Asassn-14dx显示出非凡的爆发,其特征是小爆发幅度(类似于2.3 mag)和长期(> 4yr)。因为我们在爆发检测前发现了123D的长期观察差距,所以我们建议错过了主要的突出高原,并且这种爆发只是在WZ SGE型超级爆发后经常看到的“褪色尾巴”。为了区分WZ SGE和SU UMA型DWARF NOVAE(DNE),我们在统计上调查了GAIA数据版本2(DR2)。我们应用了逻辑回归模型,并通过使用绝对Gaia幅度M-G和Gaia颜色G(BP)-G(RP)进行了成功进行分类。我们的新分类器还表明ASASSN-14DX是WZ SGE型DN的最佳候选者。我们通过使用Gaia DR2视差估计来自已知的WZ SGE恒星的距离。结果表明,ASASSN-14DX是第三次最接近的WZ SGE之星(WZ SGE和V455和V455旁),因此该对象可以显示最大值为v = 8-9的第三亮WIZS型超突发梅。

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