Testing the criteria for stable mass transfer in cataclysmic variables

About 2% of the CVs in the Ritter & Kolb catalogue have mass estimates for their components that suggest that they are undergoing unstable mass transfer, contrary to the canonical model of the evolution of CVs. We have previously revised the mass values for three of them, and found them to be stable. We review the observations for the other nine and find that two of them are in fact probably stable even with their published mass estimates. The remaining seven objects either have poorly determined properties or lie firmly in the unstable region, or both, and should be re-observed.