论文标题
极地V496 UMA中的瞬态两极积聚
Transient two pole accretion in the polar V496 UMa
论文作者
论文摘要
我们报告了XMM-Newton和V496 UMA的苔丝观察，这是AM Herculis型灾难性变量。 XMM-Newton的观察结果表明，有时，在白色矮人增生的两个杆子同时进行，但在次级磁极上的积聚是不稳定的，几乎可以在不到一个二进制轨道（1.5 h）中停止。在主要最大值期间X射线光谱的建模表明，当积聚到次级极到次级极点时，积聚结构没有变化，这表明积聚到次级极点的破坏可能是由供体恒星的质量转移变化引起的。苔丝观察结果在两分钟的节奏上跨越了八周，它显示出稳定的，双重凸起的轨道调节，这是由于回旋后区域的回旋发射而导致的，而观察到的最大光线的时间显示出缓慢的系统漂移，与系统的整体亮度无关。
We report XMM-Newton and TESS observations of V496 UMa, an AM Herculis-type cataclysmic variable. The XMM-Newton observation reveals that at times, two poles on the white dwarf accrete simultaneously, but accretion onto the secondary magnetic pole is erratic and can nearly cease in less than one binary orbit (1.5 h). Modelling of the X-ray spectrum during the primary maximum reveals no change in the accretion structures onto the primary pole when accretion onto the secondary pole is disrupted, suggesting that the disruption of accretion onto the secondary pole may be caused by mass-transfer variations from the donor star. The TESS observation, which spanned eight weeks at a two-minute cadence, shows a stable, double-humped orbital modulation due to cyclotron emission from the post-shock region, while the observed times of maximum light show a slow systematic drift that does not correlate with the system's overall brightness.
