High Proper Motion Star

Proper motion is the motion of a star against the “stellar background” or against the celestial coordinate grid itself.  Over the course of centuries, stars appear to maintain nearly fixed positions with respect to each other, so that they form the same constellations over historical time.   Those sorts of stars do not have high proper motion.  Stars with high proper motion are especially interesting since they are generally either nearby or are special high velocity stars such as stars in the halo.