is an artists drawing of a Cataclysmic Variable Binary star system which contains a large cool star that fills its
Roche Lobe (Restricted Problem of Three Bodies) and is losing mass through the inner Lagrangian Point into the
Lobe surrounding the other star which is a white dwarf. The material spirals in
through an accretion disk before falling onto the white dwarf. The compact star can also be a neutron star
or black hole and in that case it is called a Low Mass X-ray Binary.
is the optical light curve showing the brightness of Nova V723 Cas which erupted in 1995
and exhibited an extremely unusual set of peaks around maximum brightness. We
have recently observed it with the SWIFT satellite and find that it is still emitting in X-rays.