RX J2133.7+5107: identification of a new long period Intermediate Polar
RX J2133.7+5107: identification of a new long period Intermediate Polar
We report the first time-resolved photometric and spectroscopic optical observations of the X-ray source RX J2133.7+5107, identified in the ROSAT survey. A clear persistent optical light pulsation is discovered with fast photometry at a period of s which we associate with the spin period of an accreting white dwarf. Radial …