Pulsar population characteristics and evolution of massive binaries

Astronomy and Astrophysics – Astronomy

Scientific paper

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Binary Stars, Massive Stars, Pulsars, Stellar Evolution, Magnetic Field Configurations, Spatial Distribution

Scientific paper

A uniform statistical description of the sample of pulsars including the millisecond and binary pulsars is obtained by considering them to originate from the main-sequence population of both single and binary stars. Assuming that a substantial fraction of pulsars have a binary origin, the observed gap in the field strength and spin period distribution of pulsars is shown to arise from a corresponding gap in the mass distribution of the secondary star (after the first-stage mass transfer) in binary systems. Magnetic field decay time-scales of about 10 exp 8 yr are shown to be consistent with the above analysis. Implications of this for the idea of the plateau value of magnetic field strength, below which the decay time-scale for a pulsar is larger than for the normal pulsars, are discussed.

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