Separated at Birth: The Origin of the Pulsars B2020+28 and B2021+51 in the Cygnus Superbubble

High precision astrometric data have enabled us to determine the trajectoriesthrough the Galactic potential for a growing number of pulsars. This hasresulted in the discovery of a pulsar pair (B2020+28 and B2021+51) that has acommon origin in the Cygnus Superbubble or in one of its related OBassociations at an epoch which is comparable with the spin-down ages of thepulsars. Analysis of the Galactic orbits indicates that the progenitors of thepulsars had similar masses and were in a binary system, which was disruptedafter the second supernova explosion. The implied pulsar birth velocities areconsistent with the high velocities of neutron stars in general. The initialspin period of the pulsar that was formed in the second supernova explosion wasapproximately 200 ms. A further increase in astrometric accuracy will allow usto more tightly constrain the birth velocities and the kick velocities thatwere imparted by the two respective supernova explosions. Two additionalpulsars in the sample of 24 with parallax measurements may also have originatedin the Cygnus Superbubble.Comment: 9 pages, 7 figures; emulateapj; Accepted by Ap