Separated before birth: pulsars B2020+28 and B2021+51 as the remnants of runaway stars

Details Separated before birth: pulsars B2020+28 and B2021+51 as the remnants of runaway stars Separated before birth: pulsars B2020+28 and B2021+51 as the remnants of runaway stars

2007-05-29

arxiv.org/abs/0705.4192v1

Astron.Astrophys.470:L9-L12, 2007

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, accepted for publication in A&A Letters

Scientific paper

10.1051/0004-6361:20077693

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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