HOUSTON (AP) — The Houston Astros added bullpen help Friday night when they traded for Minnesota right-hander Ryan Pressly.Houston sent two prospects — right-hander Jorge Alcala and outfielder Gilberto Celestino — to the Twins.The 29-year-old Pressley is 1-1 with a 3.40 ERA and 69 strikeouts in 51 appearances this season. He adds depth in the bullpen to a team that sent closer Ken Giles to the minors earlier this month after he struggled most of the season. Pressly has spent his entire six-year career with the Twins, where he’s 17-16 with a 3.75 ERA in 281 games.Alcala is 3-7 with a 3.29 ERA in 19 games between Double-A Corpus and Class-A Advanced Buies Creek this season.The 19-year-old Celestino is hitting .299 with four homers and 21 RBIs combined between Corpus Christi and Class-A Tri-City.