SW Sextantis systems are nova-like cataclysmic variables that have unusual spectroscopic properties, which are thought to be caused by an accretion geometry having part of the mass flux trajectory out of the orbital plane. Accretion onto a magnetic white dwarf is one of the proposed scenarios for these systems. To verify this possibility, we analyzed photometric and polarimetric time-series data for a sample of six SW Sex stars. We report possible modulated circular polarization in BO Cet, SW Sex, and UU Aqr with periods of 11.1, 41.2, and 25.7 minutes, respectively, and less significant periodicities for V380 Oph at 22 minutes and V442 Oph at 19.4 minutes. We confirm previous results that LS Peg shows variable circular polarization. However, we determine a period of 18.8 minutes, which is different from the earlier reported value. We interpret these periods as the spin periods of the white dwarfs. Our polarimetric results indicate that 15% of the SW Sex systems have direct evidence of magnetic accretion. We also discuss SW Sex objects within the perspective of being magnetic systems, considering the latest findings about the demography, formation, and evolution of cataclysmic variables.

SW Sixtantis 系统是类似新星的灾难变星，具有不寻常的光谱特性，这被认为是由吸积几何形状引起的，其中一部分质量通量轨迹位于轨道平面之外。吸积到磁性白矮星上是这些系统的提议场景之一。为了验证这种可能性，我们分析了六个西南性别星样本的光度和偏振时间序列数据。我们报告了 BO Cet、SW Sex 和 UU Aqr 中可能的调制圆极化，周期分别为 11.1、41.2 和 25.7 分钟，V380 Oph 为 22 分钟，V442 Oph 为 19.4 分钟。我们确认了先前的结果，即 LS Peg 显示可变圆极化。但是，我们确定了 18.8 分钟的时间段，这与之前报告的值不同。我们将这些周期解释为白矮星的自转周期。我们的极化结果表明，15% 的 SW Sex 系统具有磁吸积的直接证据。我们还从磁系统的角度讨论 SW Sex 天体，并考虑到有关灾难性变量的人口学、形成和演化的最新发现。