ohsurvey.tex accepted by A & A Supplements 
To: gcnews@astro.umd.edu (Galactic Center Newsletter)
Date: Tue, 1 Jul 1997 20:20:38 +0200 (MET DST)
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\documentstyle{l-aa}
\begin{document}
\thesaurus{ 02.13.3; 03.13.2; 04.03.1; 04.19.1 08.16.4; 10.03.1}
\title{ A new sample of OH/IR stars in the Galactic center }
\author{ Lor\'ant O.\ Sjouwerman\inst{1,2} \and Huib Jan van
 Langevelde\inst{3} \and Anders Winnberg\inst{1} \and Harm J.\ Habing\inst{2}}
\offprints{ L.O.\ Sjouwerman (Onsala); Email: sjouwerm@oso.chalmers.se}
\institute{ Onsala Rymdobservatorium, S - 439 92 Onsala, Sweden
            \and Sterrewacht Leiden, P.O.\ Box 9513, 2300 RA Leiden,
                 The Netherlands
            \and Joint Institute for VLBI in Europe, Radiosterrenwacht
                 Dwingeloo, P.O.\ Box 2, 7990 AA Dwingeloo, The Netherlands}
\date{ Received April 14, 1997, accepted June 4, 1997,
       \em to be published in A\&A Supplement Series}
\maketitle
\begin{abstract}

Two independent, largely overlapping 1612 MHz data sets were searched
for OH/IR stars in the Galactic center. One set, taken with the Very
Large Array in the period 1988 to 1991, consists of 17 epochs monitoring
data of Van Langevelde et al.\ (1993). The other set was observed in
1994, using the Australia Telescope Compact Array. This article
describes the data reduction procedures as well as a different way of
searching image cubes for narrow line sources, and
lists\footnote{Figures 4 and 5 are only published electronically at CDS
via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5), or via the WWW
at http://cdsweb.u-strasbg.fr/Abstract.html. Tables 2 and 3 are also
available in electronic form at CDS.} a total of 155 double peak OH
maser detections within 18$\arcmin$ or 40 projected parsecs of
Sagittarius~A*, the compact radio continuum source in the Galactic
nucleus. Presented are 65 formerly unseen double peaked 1612 MHz
emitters, of which 52 are OH/IR stars. Also given are 3 single peak
sources, which we believe to be masers of OH/IR stars. Apart from being
less bright in their 1612 MHz OH maser line, the previously unknown
OH/IR stars do not seem to be different from the previously known
population of OH/IR stars in the Galactic center. We find that the OH/IR
star OH maser luminosity distribution peaks at L$_{\rm OH}\approx
10^{43.4}$ photons per second. Further physical and kinematical analysis
of the new sample will be presented in additional papers.

\keywords{ Masers -- Methods: data analysis -- Catalogs --
           Surveys -- Stars: AGB and post-AGB -- Galaxy: center}
\end{abstract}