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Paper: On the Variability of the Isolated Neutron Star RX J0720.4–3125
Volume: 511, Non-Stable Universe: Energetic Resources, Activity Phenomena and Evolutionary Processes
Page: 51
Authors: Hambaryan, V.; Neuhäuser, R.
Abstract: A significant flux and spectral variability over a time scale of years in the X-ray emission of the isolated neutron star RX J0720.4-3125 has been studied based on the all observations conducted by XMM-Newton (2000-2012) years. This first ever detected non-stationary phenomenon in one of the seven radio-quiet, X-ray pulsating isolated neutron stars (INSs) discovered by ROSAT shows long–term variations in its spectral (black body temperature, size of the emitting area, the depth of the absorption feature) and timing parameters (spin period, pulse profile). The reason of this enigmatic behaviour is still unclear: cyclic variations are expected if the neutron star precesses while a sudden event like a glitch or an episode of a clumpy accretion from ambient medium may cause a gradual evolution after a relatively fast change.
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