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Follow-up spectroscopy with this telescope was conducted as a back-up for a main program which needed photometric conditions. So, the observations presented here were obtained in non-photometric conditions and the absolute flux calibration of the data is unreliable.
The Cassegrain focal reducer CAFOS of the 2.2m telescope was used with
a long slit of 300
3
and a grism of 187 Å
mm-1 linear dispersion. Spectra were recorded on a 2K
2K
Site CCD operated in a 2
1 binned mode (binning only along the
dispersion direction), resulting in a spectral resolution of about 20
Å (FWHM), and a wavelength coverage
Å. No order separation filter was installed. The slit orientation
was again not aligned with the parallactic angle to keep the
duty-cycle high. The exposure times varied between 10 and 15 minutes
depending on the object brightness. The observations were complemented
by standard star flux measurements, Hg-He-Cd lamp exposures for
wavelength calibration, dome flat-, bias-, and dark-frames. The seeing
was between 1.5 and 2.5
(FWHM).