A Complete Sample of Hot UV-Bright Stars in Globular Clusters

Details A Complete Sample of Hot UV-Bright Stars in Globular Clusters A Complete Sample of Hot UV-Bright Stars in Globular Clusters

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.5401l&link_type=abstract

American Astronomical Society, 192nd AAS Meeting, #54.01; Bulletin of the American Astronomical Society, Vol. 30, p.896

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present preliminary results of our program to obtain optical and ultraviolet spectra of all UV-bright objects discovered on wide-field (40') ultraviolet images of fourteen globular clusters observed with the Ultraviolet Imaging Telescope (UIT). The star M4-Y453 (Teff = 59,000 K, log g = 5.2) is the hottest post-AGB star without a planetary nebula yet found in a globular cluster. A STIS low-resolution ultraviolet spectrum of NGC 6723 - III60 (Teff = 40,000 K, log g = 5.2) shows a large overabundance of nitrogen. The sdO stars in globular clusters can be classified as either post-EHB (extreme horizontal branch) stars with strong helium depletions, or as post-AGB stars with approximately solar helium abundances.

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