A&A 365, 49-77 (2001)
On the origin of the O and B-type stars with high velocities
II. Runaway stars and pulsars ejected from the nearby young stellar groupsR. Hoogerwerf , J. H. J. de Bruijne and P. T. de Zeeuw .
Sterrewacht Leiden, Postbus 9513, 2300 RA Leiden, The Netherlands
(Received 17 August 2000 / Accepted 28 September 2000)
We use milli-arcsecond accuracy astrometry (proper motions and parallaxes) from Hipparcos and from radio observations to retrace the orbits of 56 runaway stars and nine compact objects with distances less than 700 pc, to identify the parent stellar group. It is possible to deduce the specific formation scenario with near certainty for two cases. (i) We find that the runaway star Ophiuchi and the pulsar PSR J1932+1059 originated about 1 Myr ago in a supernova explosion in a binary in the Upper Scorpius subgroup of the Sco OB2 association. The pulsar received a kick velocity of 350 km s-1 in this event, which dissociated the binary, and gave Oph its large space velocity. (ii) Blaauw & Morgan and Gies & Bolton already postulated a common origin for the runaway-pair AE Aur and Col, possibly involving the massive highly-eccentric binary Ori, based on their equal and opposite velocities. We demonstrate that these three objects indeed occupied a very small volume 2.5 Myr ago, and show that they were ejected from the nascent Trapezium cluster. We identify the parent group for two more pulsars: both likely originate in the 50 Myr old association Per OB3, which contains the open cluster Persei. At least 21 of the 56 runaway stars in our sample can be linked to the nearby associations and young open clusters. These include the classical runaways 53 Arietis (Ori OB1), Persei (Per OB2), and Cephei (Cep OB3), and fifteen new identifications, amongst which a pair of stars running away in opposite directions from the region containing the Ori cluster. Other currently nearby runaways and pulsars originated beyond 700 pc, where our knowledge of the parent groups is very incomplete.
Key words: Astrometry - stars: early-type - stars: kinematics - pulsars: general - supernova: general
Offprint request: P. T. de Zeeuw, firstname.lastname@example.org
© ESO 2001