LP 543-25: a rare low-mass runaway disk star
  LP 543-25 or PSS 544-7 is a high proper-motion star located 458 pc from the
Sun in the constellation of Canis Minor; it has been argued that it could be a
candidate cannonball star ejected by a star cluster. Here, we revisit the issue
of the kinematics of this interesting star using Gaia DR2. The heliocentric
Galactic velocity components are (U, V, W) = (206, -289, 30) km/s; the
corresponding Galactocentric Galactic velocity components show that LP 543-25
is moving in the Galactic plane and away from the Galactic Center at a rate of
nearly 200 km/s, which is compatible with an origin in one of the multiple star
clusters that inhabit the inner regions of the Milky Way. LP 543-25 appears to
be a member of an elusive class of stars, the low-mass runaway stars. It is
perhaps one of the closest and less massive runaway stars identified so far.
