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From paco@usmu01.usm.uni-muenchen.de Mon Sep  8 06:16:57 1997
Date: Mon, 8 Sep 1997 12:16:43 +0200 (MET DST)
From: Francisco Najarro <paco@usmu01.usm.uni-muenchen.de>
To: gcnews@astro.umd.edu
Subject: Accepted paper by Najarro et al
Mime-Version: 1.0



\def\kms{\hbox{km$\,$s$^{-1}$}}
\def\Msunyr{\hbox{M$_\odot\,$yr$^{-1}$}}
\def\Lsun{\hbox{L$_\odot$}}
\def\Vinf{\hbox{V$_\infty$}}
\def\Mdot{\hbox{$\dot {\rm M}$}}
\def\NH{\hbox{N$_{\hbox{H}}$}}
\def\NHe{\hbox{N$_{\hbox{He}}$}}

%%ftp://ftp.usm.uni-muenchen.de/pub/paco/gcpap_aa.ps.gz  

\begin{center}
\title{\Large\bf  Quantitative Spectroscopy of the HeI Cluster in the 
Galactic Center
}\end{center}
\centerline{\bf
F.~Najarro(1) A.~Krabbe(2),
  R.~Genzel(2), D.~Lutz(2), R.~P.~Kudritzki(1,3)$
\and D.J.~Hillier(4)
}
\address{
     (1) Institut f\"ur Astronomie 
und Astrophysik der Universit\"at M\"unchen, Scheinerstr. 1, 81679 M\"unchen,
Germany
 \\  (2)   Max-Planck-Institut f\"ur extraterrestrische Physik,
85740 Garching bei M\"unchen, Germany
 \\  (3) Max-Planck-Institut f\"ur
  Astrophysik, 85740 Garching bei M\"unchen, Germany
 \\  (4)  Department of Physics and  Astronomy, University
of Pittsburgh, 3941 O'Hara Street, Pittsburgh, PA 15260, USA
}\vspace*{4mm}  \\
\abstract{
We present results on quantitative infrared spectroscopy of the
 brightest \HeI\ emission line stars in the Galactic center.
The observed \HeI\ and H broad emission lines
 are caused by extremely strong stellar winds
($\Mdot\sim$ 5 to 80 $\times 10^{-5}\, \Msunyr$)
with relatively small outflow velocities (\Vinf $\sim$ 300 to 1000~\kms).
The effective temperatures of the objects range from 17,000\,K to 30,000\,K
with corresponding  stellar luminosities of 1 to $30 \times 10^{5}$\Lsun.
 Strongly enhanced helium
abundances (\NHe/\NH$>.5$) are found.
These results indicate that
the \HeI\ emission line stars are evolved blue supergiants  close to
the evolutionary stage of Wolf-Rayet stars. They power the central parsec
and belong to a young stellar cluster of massive stars which formed a
few million years ago.)
}
{\bf   Accepted by  A\& A } \\
{\it Preprints from} {\tt paco@usm.uni-muenchen.de   } \\
{\it or by anonymous ftp to} {\tt ftp.usm.uni-muenchen.de  pub/paco/gcpap_aa.ps.gz  }    \\
{\it or on the web at} {\tt ... }  



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