Optical Studies of 20 Longer-Period Cataclysmic Binaries1
Optical Studies of 20 Longer-Period Cataclysmic Binaries1
We obtained time-series radial-velocity spectroscopy of 20 cataclysmic variable stars, with the aim of determining orbital periods Porb. All of the stars reported here prove to have Porb > 3.5 h. For 16 of the stars, these are the first available period determinations, and for the remaining four (V709 Cas, …