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A&A Supplement series, Vol. 128, February II 1998, 35-65
Received April 14, accepted June 4, 1997
A new sample of OH/IR stars in the Galactic center
L.O. Sjouwerman
- H.J. van
Langevelde
- A. Winnberg
- H.J. Habing
Send offprint request: L.O. Sjouwerman (Onsala); e-mail: sjouwerm@oso.chalmers.se
Onsala Rymdobservatorium, S-439 92 Onsala, Sweden
Sterrewacht Leiden, P.O. Box 9513, 2300 RA Leiden,
The Netherlands
Joint Institute for VLBI in Europe, Radiosterrenwacht
Dwingeloo, P.O. Box 2, 7990 AA Dwingeloo, The Netherlands
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
a
total of 155 double peak OH maser detections within 18
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 
photons per second. Further physical and kinematical analysis
of the new sample will be presented in additional papers.
keywords: masers -- catalogs -- surveys -- stars: AGB and post-AGB -- Galaxy: center -- radio lines: stars
SIMBAD ObjectsTables at the CDS
Copyright by the European Southern Observatory (ESO)