1RXS J180431.1-273932 is an intermediate polar: a cataclysmic variable star with a rapidly rotating, magnetized white dwarf. We analyze the system’s Kepler K2 short-cadence light curve and identify a strong, highly coherent pulse with a period of 0.00571710.0000002days, which matches the proposed white dwarf rotational period identified in previous X-ray studies. We establish an ephemeris for the optical spin pulse.

中文翻译：

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Kepler K2 测量中间极性 1RXS J180431.1-273932 的旋转周期

1RXS J180431.1-273932 是一个中间极地：一颗具有快速旋转的磁化白矮星的灾难变星。我们分析了系统的开普勒 K2 短节奏光曲线，并确定了一个周期为 0.00571710.0000002 天的强、高度相干脉冲，这与先前 X 射线研究中确定的白矮星自转周期相匹配。我们建立了光学自旋脉冲的星历表。