The population of black widow pulsars

Details The population of black widow pulsars The population of black widow pulsars

2005-02-24

arxiv.org/abs/astro-ph/0502511v1

Mon.Not.Roy.Astron.Soc. 358 (2005) 1501-1504

Astronomy and Astrophysics

Astrophysics

MNRAS accepted

Scientific paper

10.1111/j.1365-2966.2005.08877.x

We consider the population of black widow pulsars (BWPs). The large majority of these are members of globular clusters. For minimum companion masses < 0.1 Msun, adiabatic evolution and consequent mass loss under gravitational radiation appear to provide a coherent explanation of all observable properties. We suggest that the group of BWPs with minimum companion masses > 0.1 Msun are systems relaxing to equilibrium after a relatively recent capture event. We point out that all binary millisecond pulsars (MSPs) with orbital periods P < 10 h are BWPs (our line of sight allows us to see the eclipses in 10 out of 16 cases). This implies that recycled MSPs emit either in a wide fan beam or a pencil beam close to the spin plane. Simple evolutionary ideas favour a fan beam.

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