We have observed the hot post-AGB star ZNG 1 in the globular cluster M5 with the Far Ultraviolet Spectroscopic Explorer ( FUSE ) . From the resulting spectrum , we derive an effective temperature T _ { eff } \sim 45 , 000 K , a rotational velocity v _ { rot } \sim 100 km s ^ { -1 } , carbon and nitrogen abundances approximately ten times solar , a wind velocity v _ { \infty } \sim 1000 km s ^ { -1 } , and evidence for an expanding shell of material around the star .
The carbon and nitrogen enhancements suggest dredge-up of nuclear-processed material on the AGB .
The high rotational velocity may reflect a previous merger with a binary companion .