Time Variability of Gamma Cassiopeiae in X-Rays
Frontera, F.; Costa, E.; Manzo, G.; Robba, N. R.; Re, S.; dal Fiume, D.
Italy
Abstract
A 22,000 s observation with EXOSAT of the X-ray source 4U 0053+60/Gamma Cassiopeiae reveals oscillations in the X-ray flux with a period of about 6000 s. The source also exhibits chaotic variability with time scales down to a few tens of seconds. This observation strengthens the hypothesis that the X-ray source is a neutron star in a wide orbit around the Be star γ Cas.