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Hopkins Ultraviolet Telescope Observations of U Geminorum Far from Outburst
 

Summary: Hopkins Ultraviolet Telescope Observations of
U Geminorum Far from Outburst
Knox S. Long
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218
long@stsci.edu
William P. Blair
Department of Physics & Astronomy, The Johns Hopkins University, Baltimore, MD 21218
wpb@pha.jhu.edu
and
John C. Raymond 1
Smithsonian Astrophysical Observatory, 60 Garden Street, Cambridge, MA 02138
raymond@cfa.harvard.edu
ABSTRACT
The Hopkins Ultraviolet Telescope was used during the Astro--2 space
shuttle mission to obtain a far ultraviolet (820 -- 1840 A) spectrum of the dwarf
nova U Geminorum in its low state. At the time of the observation, U Gem
had been at optical minimum for 185 days. The HUT spectrum is dominated
by the white dwarf star, and shows (among other things) very strong, broad
hydrogen Lyman absorption lines. A comparison with solar abundance white
dwarf models indicates a temperature near 30,000 K. Comparison to a similar

  

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

 

Collections: Physics