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Observations of the UVBright Star in 47 Tucanae with the Hopkins Ultraviolet Telescope
 

Summary: Observations of the UV­Bright Star in 47 Tucanae
with the Hopkins Ultraviolet Telescope
W. Van Dyke Dixon 1 and Arthur F. Davidsen
Department of Physics and Astronomy, The Johns Hopkins University
Charles and 34th Streets, Baltimore, Maryland 21218
wvd@pha.jhu.edu, afd@pha.jhu.edu
and
Henry C. Ferguson 2
Space Telescope Science Institute, Baltimore, MD 21218
ferguson@stsci.edu
To appear in The Astrophysical Journal (Letters)
ABSTRACT
The UV­bright star `BS' in the globular cluster 47 Tuc (NGC 104) was observed
with the Hopkins Ultraviolet Telescope (HUT) during the Astro­2 space shuttle
mission in 1995 March. The resulting spectrum extends from 912 to 1840 š A with a
resolution of ¸ 3 š A. It has numerous absorption features, but no emission features other
than terrestrial airglow lines. We have fit the data with Kurucz stellar atmosphere
models using a Ø 2 minimization technique. The Kurucz model which best fits the
observed spectrum has T eff = 11; 000 K, log g = 2:5, and [M=H ] = \Gamma1:0; however,
it overpredicts the flux in the sub­Lyfi region by nearly a factor of three. Kurucz

  

Source: Henry, Richard C.- Department of Physics and Astronomy, Johns Hopkins University

 

Collections: Physics