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FUSE Observations of the Post-AGB Star ZNG 1 in the Globular Cluster M5 (NGC 5904)
W. V. Dixon, T. M. Brown, W. B. Landsman
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…
Spectroscopic Analyses of the "Blue Hook" Stars in omega Centauri: A Test of the Late Hot Flasher Scenario
S. Moehler, A. V. Sweigart, W. B. Landsman +1
omega Cen contains the largest population of very hot horizontal branch (HB) stars known in a globular cluster. Recent UV observations (Whitney et al. 1998; D'Cruz et al. 2000) sho…
A New Formation Mechanism for the Hottest Horizontal-Branch Stars
Allen V. Sweigart, Thomas M. Brown, Thierry Lanz +2
Stars with very large mass loss on the red-giant branch can undergo the helium flash while descending the white-dwarf cooling curve. Under these conditions the flash convection zon…
The Origin of Hot Subluminous Horizontal-Branch Stars in Omega Centauri and NGC 2808
Allen V. Sweigart, Thomas M. Brown, Thierry Lanz +2
Hot subluminous stars lying up to 0.7 mag below the extreme horizontal branch (EHB) are found in the UV color-magnitude diagrams of omega Cen and NGC 2808. Such stars are unexplain…