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Members of widely-separated stellar binaries (> 0.1 pc) or loosely boundstellar associations and clusters are born with small spreads in kinematics andchemistry, but disrupt and dissociate on timescales comparable to their orbitaltime within the Milky Way. The kinematic properties of comoving starpairs---bound wide binaries or unbound but coeval stars---are thereforesensitive to both the smooth tidal field and gravitational perturbationspectrum of the Milky Way. In previous work, we identified >4,000 candidatecomoving pairs using only astrometric data from the Tycho-Gaia AstrometricSolution (TGAS) catalog and find a large number of pairs with separations > 1pc. Without radial velocity measurements for the vast majority of these pairs,the false-positive rate at these separations is significant (~50%). Here wepresent results from our own low-resolution radial-velocity survey of a randomsample of the candidate pairs to identify and validate true comoving starpairs. Of the 311 observed comoving pairs, we confirm 127 comoving pairs withseparations as large as ~10 pc, our original search limit. Between separationsof 0.001 pc to ~0.5 pc, the number of confirmed pairs per separation decreaseswith increasing separation (number per log separation is uniform). From ~0.5 pcto 10 pc, the number per separation is approximately uniform (number per logseparation increases). We confirm the discovery of a population of comovingstar pairs at very large separations, suggesting that disrupted wide binariesand stellar associations remain approximately spatially coherent.

Spectroscopic confirmation of very-wide stellar binaries and large-separation comoving pairs from Gaia DR1