Radial-velocities of 20 cataclysmic var.

We obtained time-series radial-velocity spectroscopy of 20 cataclysmic variable stars, with the aim of determining orbital periods P_orb_. All of the stars reported here prove...我们对20颗激变变星（cataclysmic variable stars）开展了时间序列径向速度光谱观测，旨在测定其轨道周期P_orb。本文所报道的全部恒星均已证实……