Physical Environment of Accreting Neutron Stars

Figure 2

Magnetic fields and spin periods of observed pulsars (data taken from the ATNF pulsar catalogue). Black dots denote normal pulsars. Red dots represent MSPs. Green triangles are pulsars in binaries. The “spin-up line” represents the minimum spin period to which a spin-up process may proceed in an Eddington-limited accretion, while the “death line” corresponds to a polar cap voltage below which the pulsar activity is likely to switch off [17].