Persistent Be X-ray binaries share a hot (1-2 keV) blackbody component contributing 20-40% of the X-ray flux, with an emitting size close to the neutron star polar cap, and a new XMM-Newton observation of 4U 0728-25 fits this pattern.
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The role of XMM-Newton in the investigation of persistent BeXRBs
Persistent Be X-ray binaries share a hot (1-2 keV) blackbody component contributing 20-40% of the X-ray flux, with an emitting size close to the neutron star polar cap, and a new XMM-Newton observation of 4U 0728-25 fits this pattern.