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NSV 1440: first WZ Sge-type object in AM CVn stars and candidates

机译:NSV 1440:AM CVN明星和候选人的第一个WZ SGE型对象

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In 2015 and 2017, the AM CVn candidate NSV 1440 showed superoutbursts that had the characteristic features of WZ Sge-type dwarf novae (DNe). By analogy with hydrogen-rich cataclysmic variables (CVs), we can interpret these outbursts as "double superoutbursts" which are composed of a first superoutburst with early superhumps and a second superoutburst with ordinary superhumps. The object also showed multiple rebrightenings after the main superoutbursts. Early superhumps had never before been observed in AM CVn stars and candidates, thus NSV 1440 is the first confirmed WZ Sge-type AM CVn candidate. We obtained an early superhump period of 0.0252329(49) d and a growing (stage A) superhumps period of 0.025679(20) d from the 2015 superoutburst. We regarded the early superhump period as the orbital one. By using these periods we estimated the mass ratio q = 0.045(2). This value suggests that NSV 1440 is indeed an AM CVn star and that the secondary is a semi-degenerate star.
机译:2015年和2017年,AM CVN候选NSV 1440展示了具有WZ SGE型DWARF Novae(DNE)的特征特征的超级推导。 通过比喻与富含氢的灾难性变量(CVS),我们可以将这些爆发作为“双超级超级爆炸”,它由具有早期超级超级爆炸的第一超级爆炸和第二个超级超级爆炸物组成。 该对象还在主要超级爆发后显示了多次重建。 在AM CVN恒星和候选中,从未观察过早期的超级泵,因此NSV 1440是第一个确认的WZ SGE型AM CVN候选者。 我们获得了0.0252329(49)D的早期超级泵,以及2015年超级骨折的0.025679(20)D的生长(阶段a)超级峰值。 我们将早期超级泵视为轨道性的。 通过使用这些时期,我们估计质量比Q = 0.045(2)。 该值表明NSV 1440确实是AM CVN星,并且次级是半退化星。

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