标题： RX J2115-5840：一个新的近同步极地天体的确认 显示英文标题

标题： RX J2115-5840: confirmation of a new near-synchronous polar

摘要： 施沃普等（1997）建议新发现的极地RX J2115-5840是一个近同步系统。 我们获得了RX J2115-5840的圆偏振观测数据，这些数据显示自转周期和轨道周期相差1.2%。 我们在一个近同步极地系统中找到了“极性切换”的直接证据。 此外，我们的数据表明吸积流必须在所有自转-轨道拍频相位上指向同一磁力线，这意味着在某些相位，流必须绕白矮星运行后再进行吸积。 显示英文摘要

摘要： Schwope et al (1997) suggested that the newly discovered Polar RX J2115-5840 is a near-synchronous system. We have obtained circular polarisation observations of RX J2115-5840 which show that the spin and orbital periods differ by 1.2%. We find the first direct evidence of `pole-switching' in a near-synchronous Polar. Further our data requires that the accretion flow must be directed onto the same magnetic field line at all spin-orbit beat phases implying that at some phases the flow must follow a path around the white dwarf before accreting.