What is the star with the highest proper motion whose companion of is Alpha Centauri B ?
select ?ent where { ?ent wdt:P31 wd:Q523 . ?ent wdt:P2215 ?obj . ?ent wdt:P399 wd:Q1052548 } ORDER BY DESC(?obj)LIMIT 5 
star: Q523 alpha centauri b: Q1052548