The detection of the donor star in IY UMa
  We present the results of a search for the donor star in the high inclination SU UMa type cataclysmic variable IY UMa. We detect absorption features in the near infrared consistent with an M type dwarf donor star. Using the skew mapping technique to exploit the velocity information provided by the 8183-8194 Angstrom Na I absorption doublet, we locate the absorption at the expected donor velocity of IY UMa. 
Daniel J. Rolfe (1 and 2), Timothy M. C. Abbott (3 and 4) and Carole   A. Haswell (2) ((1) University of Leicester, (2) The ...