弓形激波、新星弹、碟风和倾斜碟：类似新星的V341 Ara拥有一切
Bow-shocks, nova shells, disc winds and tilted discs: The Nova-Like V341 Ara Has It All
摘要：
V341 Ara最近被认为是最接近（d ~ 150 pc）和最明亮（V~ 10）的类新星激变变星之一。这个独特的系统被一个明亮的发射星云所包围，可能是最近一次新星爆发的遗迹。在这个星云中嵌入了一个突出的弓形激波，在那里系统的吸积盘风进入了它自己的新星壳。为了建立其基本属性，我们提出了第一个全面的多波长系统的研究。长期测光显示准周期，超轨道变化的特征时间尺度为10-16天和典型的振幅~1 mag. High-cadence测光TESS揭示了第一次的轨道周期和一个“负超级峰”的周期。后者通常被解释为一个倾斜的吸积盘的签名。我们提出了一个最近开发的光盘不稳定模型作为一个合理的解释光度行为。在我们的光谱数据中，我们清楚地检测到反相吸收和发射线分量。它们的径向速度表明它们的质量比很高，这反过来又意味着白矮星的质量异常低。我们还限制风的质量损失率的系统从空间分辨的[O III]发射产生的弓形激波，这可以用来测试和校准吸积盘风模型。我们认为V341 Ara可能与公元1240年中国历史记载中的一颗“客星”有关。如果这标志着该系统的新星爆发的日期，V341 Ara将是同类中最古老的新星，也是测试新星理论的绝佳实验室。
英文摘要：
V341 Ara was recently recognised as one of the closest (d ~ 150 pc) and brightest (V~ 10) nova-like cataclysmic variables. This unique system is surrounded by a bright emission nebula, likely to be the remnant of a recent nova eruption. Embedded within this nebula is a prominent bow-shock, where the system's accretion disc wind runs into its own nova shell. In order to establish its fundamental properties, we present the first comprehensive multi-wavelength study of the system. Long-term photometry reveals quasi-periodic, super-orbital variations with a characteristic time-scale of 10-16 days and typical amplitude of ~1 mag. High-cadence photometry from TESS reveals for the first time both the orbital period and a "negative superhump" period. The latter is usually interpreted as the signature of a tilted accretion disc. We propose a recently developed disc instability model as a plausible explanation for the photometric behaviour. In our spectroscopic data, we clearly detect anti-phased absorption and emission line components. Their radial velocities suggest a high mass ratio, which in turn implies an unusually low white dwarf mass. We also constrain the wind mass-loss rate of the system from the spatially resolved [O iii] emission produced in the bow-shock; this can be used to test and calibrate accretion disc wind models. We suggest a possible association between V341 Ara and a "guest star" mentioned in Chinese historical records in AD1240. If this marks the date of the system's nova eruption, V341 Ara would be the oldest recovered nova of its class and an excellent laboratory for testing nova theory.
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