标题： 基于广泛测光数据测量中间极1RXS J230645.0+550816 (1SWXRT J230642.7+550817)的精确测光周期 显示英文标题

标题： Measuring the precise photometric period of the intermediate polar 1RXS J230645.0+550816 (1SWXRT J230642.7+550817) based on extensive photometry

摘要： 最近，Halpern 等人发现了在灾变变星 1RXS J230645.0+550816 中的一个周期为 464 秒的振荡。我对该天体进行了广泛的测光观测，以明确该振荡的相干性，并以高精度测量振荡周期。观测是在 2018 年和 2019 年的 22 个夜晚进行的。观测总时长为 110 小时。在每个长时间的观测夜晚中都发现了该振荡，并且在整个覆盖 15 个月的观测中保持相干性。由于观测范围较大，我以高精度确定了振荡周期，为 464.45600±0.00010 秒。该振荡的半振幅较大，并且从 2018 年的 41.8±1.5 mmag 变化到 2019 年的 48.6±1.8 mmag。振荡脉冲轮廓是对称的，其最小值明显比最大值更宽，并且在 2018 年和 2019 年期间没有明显变化。该振荡周期的高精度使我能够推导出一个有效期长达 70 年的振荡历表。该历表可用于未来对振荡周期变化的研究。尽管尚未在 1RXS J230645.0+550816 中检测到短周期 X 射线振荡，但由于 464 秒振荡的高度相干性，该天体属于中等极性的可能性非常高。 显示英文摘要

摘要： Recently, Halpern et al. discovered an oscillation with a period of 464 s in the cataclysmic variable 1RXS J230645.0+550816. I conducted extensive photometric observations of this object to clarify the coherence of this oscillation and to measure the oscillation period with high precision. Observations were obtained over 22 nights in 2018 and 2019. The total duration of observations was 110 hr. The oscillation was revealed in each long night of observations and was coherent throughout all my observations covering 15 months. Due to the large coverage of observations, I determined the oscillation period with high precision, which was 464.45600+\-0.00010 s. The oscillation semi-amplitude was large and showed changes from 41.8+\-1.5 mmag in 2018 to 48.6+\-1.8 mmag in 2019. The oscillation pulse profile was symmetrical with a noticeably wider minimum compared to the maximum and showed no noticeable changes during 2018 and 2019. The high precision of the oscillation period allowed me to derive an oscillation ephemeris with a long validity of 70 years. This ephemeris can be used for future studies of oscillation period changes. Although short-period X-ray oscillations have not yet been detected in 1RXS J230645.0+550816, the intermediate polar nature of this object is very probable due to the high degree of coherence of the 464-s oscillation.