We report detailed follow-up observations of 8 cataclysmic variable stars (CVs) that are apparently AM Her stars, also called polars. For all, we either determine orbital periods for the first time, or improve on existing determinations. The seven for which we have spectra show the high-amplitude radial velocity curves and prominent HeII 4686 emission lines characteristic of strongly magnetic CVs, and their periods, which range from 81 to 219 minutes, are also typical for AM Her stars. Two objects from the Gaia-alerts index, Gaia18aot and Gaia18aya, are newly identified as CVs. Another, RX J0636.3+6554, eclipses deeply, while CSS080228:081210+040352 shows a sharp dip that is apparently a partial eclipse. The spectrum of Gaia18aya has a cyclotron harmonic near 5500 Angstroms that constrains the surface field to about 49 Megagauss or greater.

中文翻译：

---

八颗 AM Herculis 型灾变变星的光学研究

我们报告了 8 颗灾难变星 (CV) 的详细后续观测，这些变星显然是 AM Her 恒星，也称为极地恒星。总之，我们要么第一次确定轨道周期，要么改进现有的确定。我们拥有光谱的七个显示了强磁 CV 的高振幅径向速度曲线和突出的 HeII 4686 发射线特征，它们的周期范围从 81 到 219 分钟，也是 AM Her 恒星的典型特征。Gaia-alerts 索引中的两个对象 Gaia18aot 和 Gaia18aya 被新识别为 CV。另一个，RX J0636.3+6554，深度日食，而 CSS080228:081210+040352 显示急剧下降，显然是偏食。Gaia18aya 的光谱在 5500 埃附近具有回旋谐波，将表面场限制在约 49 兆高斯或更高。