THE CATACLYSMIC VARIABLE WW CETI - PHYSICAL PARAMETERS AND PERIODIC PHENOMENA

We present spectroscopic and photometric data of the cataclysmic varia ble WW Get. By comparison of our radial velocity data with earlier pub lished ones we are able to restrict possible orbital periods to the tw o choices 0.175 806 90(25)(d) and 0.175 289 02(35)(d). We derive as in clination of the system i = 48(11)degrees, which is supported by the f act that the photometric lightcurve shows periodic phenomena folded on the orbital period. These features are identified as a main and an in termediate hump which vary strongly with the brightness level of the s ystem. Our derived periods place them at very unusual phases which are not conform with the normal explanation that the humps are caused by a hot spot which is seen from both front and back. However, our spectr oscopy in quiescence indicates that these phasings are real and do not result from an error in the calculation of the ephemerides.