  The Z Cam stars IW And and V513 Cas are unusual in having outbursts following
their standstills in contrast to the usual Z Cam behavior of quiescence
following standstills. In order to gain further understanding of these
little-studied systems, we obtained spectra correlated with photometry from the
AAVSO throughout a 3-4 month interval in 2011. In addition, time-resolved
spectra were obtained in 2012 that provided orbital periods of 3.7 hrs for IW
And and 5.2 hrs for V513 Cas. The photometry of V513 Cas revealed a regular
pattern of standstills and outbursts with little time at quiescence, while IW
And underwent many excursions from quiescence to outburst to short standstills.
The spectra of IW And are similar to normal dwarf novae, with strong Balmer
emission at quiescence and absorption at outburst. In contrast, V513 Cas shows
a much flatter/redder spectrum near outburst with strong HeII emission and
prominent emission cores in the Balmer lines. Part of this continuum difference
may be due to reddening effects. While our attempts to model the outburst and
standstill states of IW And indicate a mass accretion rate near 3E-9 solar
masses per year, we could find no obvious reason why these systems behave
differently following standstill compared to normal Z Cam stars.
