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W. V. Dixon (JHU), T. M. Brown (STScI), W. B. Landsman (SSAI)
We have observed the hot post-AGB star ZNG 1 in the globular cluster M5 (NGC 5904) with the Far Ultraviolet Spectroscopic Explorer (FUSE). From the resulting spectrum, we derive an effective temperature Teff ~ 45,000K, a rotational velocity vrot ~ 100km/s, carbon and nitrogen abundances approximately ten times solar, a wind with terminal velocity near 1000 km/s, 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.
This research is supported by NASA grant NAG5-10405.
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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.