  In the course of a search for common proper motion binaries, in the Jones &
Walker (JW) catalogue of proper motions in the Orion Nebula Cluster, we came
across several faint stars with proper motions larger than one arcsecond per
century and probabilities of membership P larger than 0.90. Such stars are
interesting because they could be low-mass runaway stars recently accelerated
by n-body interactions in compact multiple systems. Of particular interest
among these stars is JW 451, which has a P = 0.98, the largest transverse
velocity among all the stars with P larger or equal than 0.5 (69 km/s), and a
proper motion vector which suggests that it was accelerated by the component C
of the Trapezium some 1000 years ago. A closer examination of those JW stars
with proper motion larger than one arcsec per century revealed that two other
stars, JW 349 and JW 355 (with transverse velocities of 38 and 90 km/s
respectively), in spite of being listed with P = 0 by JW, should also be
considered part of the cluster, because these objects are also externally
ionized proplyds. In fact, Hillenbrand (1997) assigns to them probabilities of
membership of 0.99. Moreover, the proper motion errors of these two stars are
relatively small, and so they are good candidates to be runaway stars recently
accelerated in the Orion Nebula Cluster.
