Spectroscopic follow-up observations for identification of stellar counterparts
have been performed at European Southern Observatory, Chile, during five
observing runs. In the first run (09.05.91-19.05.91) we used
the MPIA 2.2m-telescope with the Boller&Chivens
spectrograph, the RCA HR CCD and
grating 
, which gave a resolution of 7.9Å and a spectral range
of 
. In the four following
runs (03.05.92-12.05.92, 26.03.93-02.04.93, 29.05.93-06.06.93, and
28.06.93-04.07.93) we observed at the ESO 1.52 m-telescope with the
B&C spectrograph, the FA2K CCD (ESO 
) and grating 
. The
resolution was 4.5Å and the spectral range 
.
(The resolution was measured from unblended
lines of the He-Ar calibration lamp.)
For each star a He-Ar wavelength calibration frame was obtained at the
respective position. Three spectrophotometric standard stars were observed
each night, and spectral standards were established by observing stars
with spectral types ranging from G0 to M4
from the MK star catalog
(Buscombe 1981, 1988).
Data reduction was performed using MIDAS (Munich Image and Data Analysis System). The reduction consisted of bias subtraction, division by a flatfield, wavelength calibration, sky subtraction, extraction of the one-dimensional spectrum and flux calibration. As the weather was usually not photometric, only relative flux calibration could be achieved.
Spectral classification was accomplished by comparison with the spectral standards from the MK catalog following the procedure outlined in Wichmann et al. (1996).