Journal
ASTRONOMY & ASTROPHYSICS
Volume 470, Issue 2, Pages L9-L12Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20077693
Keywords
pulsars : individual : PSR B2020+28; open clusters and associations : individual : PSR B2021+51
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Astrometric data on the pulsars B2020+ 28 and B2021+ 51 suggest that they originated within several parsecs of each other in the direction of the Cyg OB2 association. It was proposed that the pulsars share their origin in a common massive binary and were separated at the birth of the second pulsar following the asymmetric supernova explosion. We consider a different scenario for the origin of the pulsar pair based on a possibility that the pulsars were separated before their birth and that they are the remnants of runaway stars ejected ( with velocities similar to those of the pulsars) from the core of Cyg OB2 due to strong three- or four-body dynamical encounters. Our scenario does not require any asymmetry in supernova explosions.
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