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A survey of 22 known and suspected cataclysmic variables has been carried out with the 4.2-m WHT on La Palma, using ISIS to provide coverage of most of the optical spectrum. 10 faint stars (UU Aql, AT Cnc, EY Cyg, CG Dra, LL Lyr, NN Ser, BC UMa, DV UMa, TW Vir and REJ1629+780) and one bright one (Z Cam) show red dwarf features in the spectrum. for UU Aql, EY Cyg, LL Lyr and TW Vir, this is the fir...

The 8190-Å sodium doublet in cataclysmic variables — IV. A survey of 22 objects