Time-resolved, multi-color photometry and spectroscopy of Virgo 4 (OU   Vir): a high orbital inclination, short orbital period dwarf nova
  We present multi-color photometry and time resolved spectroscopy of OU Vir. The analysis of the quiescent light curve shows that OU Vir is characterized by i) strong cycle-to-cycle brightness variations, and ii) hot spot modulated light curve with grazing eclipse of the impact region. Colors are derived both in- and out- of eclipse. The time-resolved spectroscopy allows us to produce the radial velocity curve from the H$\alpha$ accretion disk emission line which possibly reveals only weak evidence for hot spot line emission. The hot spot is believed to be a turbulent optically thick region, producing mostly continuum emission. 
E. Mason, S. B. Howell, P. Szkody, T. E. Harrison, J. A. Holtzman, D.   W. Hoard