Historical light curves: SS Cyg
€SS Cyg observed almost continuously since 1896 (AAVSO)
€Brightness history shows a variation on a timescale of ~50 days,
€Unequal length maxima, no strict periodicity but remarkably regular timescale
€varying between
mv~8 and mv~12
(a factor of 40)
€Less than the amplitude seen in novae, hence known as Dwarf Novae
Warner (1995) from J. Cannizzo