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\title{KINEMATICS OF THE INTERSTELLAR MEDIUM IN NGC~1705:\\
~\\
IMPLICATIONS FOR DISTANT STAR-FORMING GALAXIES\thanks{Based on 
observations with the NASA/ESA {\it Hubble Space
Telescope}, obtained at the Space Telescope Science Institute, which
is operated by AURA, Inc., for NASA under contract NAS5-26555}}

\author{Timothy M.\ Heckman\/\thanks{Adjunct Astronomer, ST ScI}\\
\\
Physics and Astronomy Department\\
   Johns Hopkins University\\
   Homewood Campus\\
   Baltimore, MD 21218\\
   e-mail: heckman@pha.jhu.edu\\
\and
Claus Leitherer\\
\\
Space Telescope Science Institute\\
 3700 San Martin Drive\\
Baltimore, MD 21218\\
       e-mail: leitherer@stsci.edu}

\tobe{July 1997}{The Astronomical Journal}
\recacc{17 March 1997}{9 April 1997}

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\abstract{
We report the results of space-ultraviolet (UV) spectroscopy of the super star
cluster~`1' in the nearby dwarf starburst galaxy NGC~1705, using the Goddard
High Resolution Spectrograph on the Hubble Space Telescope. The exceptionally
high UV flux and surface brightness of NGC~1705-1 makes it ideal for studying
how UV spectral diagnostics can be used to infer the properties of the
stellar and interstellar components of starbursts at low and high redshift.
There are three main results of our analysis of these data. The first is that
most of the strong absorption lines in the spectrum of NGC~1705-1 are 
interstellar rather than stellar. This highlights the difficulty in using the 
UV spectra of galaxies to deduce their stellar content. The second is that 
we are nevertheless able to cleanly detect the signature of the stellar
population in NGC~1705-1 in the form of photospheric absorption lines
from excited transitions. We deduce an age of about 10~Myr for NGC~1705-1,
so it is a `postburst' in which a significant population of O~stars is no 
longer present. The third is that the strong resonance absorption lines are 
blueshifted by about 80~\kms\ relative to the stellar photospheric lines, 
implying that the former arise in gas in the front part of the expanding 
superbubble seen in H$\alpha$. Thus, the interstellar absorption lines are 
telling us a great deal about the hydrodynamical consequences of a 
starburst on the interstellar medium, but provide little direct information 
about the gravitational potential or mass of the galaxy. These results have 
potentially important implications for the interpretation of rest-frame UV 
spectra of high-redshift galaxies.}