optics, good flat fields and decent tracking are
necessary for photometry. Basically the
telescope tracks and images the same field of view
over several periods of variability to record the
photometric signature of the system. We
mainly focus on the photometry of contact binaries
because the periods are relatively short and
difficult to detect visually. Differential
photometry sifts through several hundred images a
night and detects subtle difference between the
target star, a comparison star and check star as
shown to the far right.
||The plot to
the left is that of the contact binary system WZ
Cyngi in the constellation Cyguns the Swan.
It shows a period of 0.5845 days.
Location of WZ_Cyg