For the identification of OH/IR stars in the Galactic center (GC), the catalog of Lindqvist et al. (1992a; LWHM) is the most complete. The pre-IRAS catalogue of stellar 1612 MHz maser sources, compiled from the literature by Te Lintel Hekkert et al. (1989; TLH), lists additional GC stellar OH maser sources that lie outside the area or velocity coverage surveyed by LWHM. However, LWHM did not confirm two sources in the TLH catalog: OH359.897-0.065 and OH0.482-0.164 (TLH numbers 175 and 207). Source OH359.897-0.065 has been discussed in Sect. 4.3. For OH0.482-0.164 (TLH#207) TLH give three references: Baud et al. (1979), Baud et al. (1981) and Olnon et al. (1981). The latter however, use the data of Baud et al. (1979).
We noticed that in
Baud et al. (1979), comparing with
Baud et al.\
(1981), the velocity and flux data corresponding to OH0.482-0.164
(OH0.48-0.13 or OH0.5-0.1) has been entered for
OH0.503-0.758 (OH0.5-0.8) and vice versa
. Source OH0.482-0.164 has been
confirmed by
Habing et al. (1983) and LWHM at the "proper" (i.e.
Baud
et al. 1981) velocities; source OH0.503-0.758 has probably been
detected as an H2O maser (with a velocity of 
;
Batchelor et al. 1980 -- who, however, did not recognise it as a
stellar source), as a signal accidently picked up in a single dish beam
pointed towards the HII region G0.55-0.85 (e.g.
Downes et al.\
1979). There are no confirmations the other way around. Therefore, the
data listed in
Baud et al. (1979) should be read as in
Baud et al.\
(1981). This means therefore also, that the velocity and flux data for
TLH#207 and TLH#214 should be exchanged. Hence, it appears that
TLH#206 and TLH#207, respectively TLH#213 and TLH#214, are entries
for the same sources.
Most surveys for OH/IR stars after 1983 are based on the IRAS Point Source Catalog data base, exploiting the highly successful predictive property of the IRAS two-colour diagram for detecting OH/IR stars (Olnon et al. 1984; Van der Veen & Habing 1988). Because of confusion in the GC, these surveys omit the GC area (however, see Taylor et al. 1993 for a description of an "IRAS Galactic Center Catalog").
Additionally to the data listed in TLH and LWHM, two other 1612 MHz surveys covering the GC have been done. Van Langevelde et al. (1992a) found two high-velocity OH/IR stars in the GC, and Sevenster et al.\ (1997) filled the gap of the GC and bulge, where the IRAS survey had suffered from confusion. Because the latter survey has a low sensitivity compared to LWHM, in particular in the GC region, no new matches were found.
We also extended our search for possible stellar counterparts for our
new detections in other wavelength regions. Many matches were found in a
preliminary list of long period K-band variables, kindly provided by Ian
Glass (for a description see
Glass et al. 1996). New detections were
cross-correlated with the SIMBAD data base (
radius),
and with data sets found in the main journals between 1979 and 1996.
However, in general the overlap is minimal.