Abstract
We present an update on our project to provide new input on the period distribution of pre-CVs by taking photometric light curves of candidate pre-CVs to detect sinusoidal (due to reflection effect) or ellipsoidal (due to Roche deformation) variability, and to determine the orbital period in positive cases. Having analysed data for 18 objects we find 6 confirmed pre-CVs or very probable candidates, 7 discarded systems, and 5 with still insufficient data. With the exception of the previously reported system LTT 560 with an orbital period P = 3.54 h, all confirmed pre-CVs have periods > 8 h, that still have to be confirmed by further observations. Among these, the clearest case is that of EC 14329-1625 with possible values of either 8.42 h or 16.84 h, depending on the variation being of sinusoidal or ellipsoidal nature, respectively. This research was supported by Fondecyt grant 1051078.
