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From: Andrea Moneti  amoneti@iso.vilspa.esa.es 

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%  My definitions
\def\asec{^{\prime\prime}}  \def\mic{\,\mu\rm m} 
\def\fu{{\rm W}/{\rm cm}^2/\mic}
\def\Teff{T_{\rm eff}}      

\def\HH{H{\sc ii}}	% HII region
\def\hh{$H_2$}		% H2 molecule
\def\arii{[Ar\sc ii\rm]}   \def\ariii{[Ar\sc iii\rm]}   
\def\neii{[Ne\sc ii\rm]}   \def\neiii{[Ne\sc iii\rm]}   
\def\siii{[S\sc iii\rm]}   \def\siv{[S\sc iv\rm]}
\def\brgam{Br-$\gamma$}    \def\paa{Pa-$\alpha$}
\def\hei{He\sc i\rm}
\def\Lsun{L_\odot} 	   \def\Msun{M_\odot}
\def\Av{A_{\rm V}}	   \def\Ak{A_{\rm K}}
\def\Asil{A_{\rm sil}}     \def\tausil{\tau_{\rm sil}}

\def\lapp{\;\raise.4ex\hbox{$<$}\kern-0.8em \lower .6ex\hbox{$\sim$}\;}
\def\gapp{\;\raise.4ex\hbox{$>$}\kern-0.8em \lower .6ex\hbox{$\sim$}\;}
\def\tbc{\bf TBC\rm}
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\begin{document}

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\title{SPECTROSCOPY OF THE PISTOL AND QUINTUPLET STARS IN THE GALACTIC
CENTRE}

\author{A.~Moneti$^{1,2}$, J.A.D.L.~Blommaert$^1$, F.~~Najarro$^3$,
D.~Figer$^4$, S.~Stolovy$^4$} \vspace{2mm} \\
\institute{$^1$ISO Data Centre, ESA Astrophysics Division, Villafranca del 
Castillo,
Spain.\\
$^2$On contract from SERCo F.M.~B.V. \\
$^3$IEM, Consejo Superior de Investigaciones Cientificas, Madrid, Spain. \\
$^4$University of California, Los Angeles, CA, USA.\\
$^5$Steward Observatory, Tucson, AZ, USA.\\
}

\maketitle

\begin{abstract}

We present initial results of a spectroscopic study of the Pistol and of
the cocoon stars in the Quintuplet Cluster.  From ISOCAM CVF 5---$17\mic$
spectroscopy of the field of the Pistol Star, we have discovered a nearly
spherical shell of hot dust surrounding this star, a probable LBV.  This
shell is most prominent at $\lambda \gapp 12\mic$, and its morphology
clearly indicates that the shell is stellar ejecta.  Emission line images
show that most of the ionised material is along the northern border of this
shell, and its morphology is very similar to that of the Pistol \HH\ region
(Yusef-Zadeh \&\ Morris, 1987).  We thus confirm that the ionisation comes
from very hot stars in the core of the Quintuplet Cluster.  An SWS spectrum
of the Pistol Nebula indicates a harder ionising radiation than could be
provided by the Pistol Star, but which is consistent with ionisation from
Wolf-Rayet stars in the Quintuplet Cluster.  The CVF 5---$17\mic$ spectra
of the cocoon stars in the Quintuplet do not show any emission feature that
could help elucidate their nature. 

\noindent[The full paper can be found in astro-ph9812046]. 
\vspace {5pt} \\

Key~words: ISO, Galactic Centre, Quintuplet, Pistol, LBVs

\end{abstract}

\end{document}


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