Hot UV bright stars in globular clusters

We have obtained medium-resolution spectra of seven UV-bright stars discovered on images of four southern globular clusters obtained with the Ultraviolet Imaging Telescope (UIT). Effective temperatures, surface gravities and helium abundances are derived from LTE and non-LTE model atmosphere fits. Three of the stars have sdO spectra, including M4-Y453 (T_eff = 58800 K, log{g} = 5.15), NGC 6723-III60 (T_eff = 40600 K, log{g} = 4.46) and NGC 6752-B2004 (T_eff = 37000 K, log{g} = 5.25). All seven stars lie along either post-extended horizontal branch (EHB) or post-early AGB evolutionary tracks. The post-early AGB stars show solar helium abundances, while the post-EHB stars are helium deficient, similar to their EHB progenitors. Based on observations collected at the European Southern Observatory (ESO N$^\circ$ 57.E-0101)