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Follow-up spectroscopy with the CAHA 2.2m telescope was carried out
during two runs (June and December, 1999, see Table 2), using
the Calar Alto Faint Object Spectrograph (CAFOS) and Cassegrain focal reducer.
During these runs a long slit of
and
a G-200 grism (187Åmm-1, first order) were used.
The B-200 grism (185Åmm-1, first order) was also used to reobserve
18 objects in order to improve the [O II]
3727Å value.
There were no order separation filters applied.
The spatial scale along the slit was
pixel-1.
A SITE 15 2K
2K CCD was operated in a 2
1 binned mode
during the December run (binning only along the dispersion direction),
while in the June run there was no binning applied.
The wavelength coverages were
3700 -
9500Å with maximum sensivity at
6000Å for the G-200 grism and
3500 -
7400Å with maximum sensivity at
4000Å for the B-200 grism.
The spectral resolution was
10Å (FWHM) in the June run and due to CCD binning
20Å (FWHM) in the December run.
The slit orientation was not aligned with the parallactic angle because of
the snap-shot observing mode. The exposure times varied within 2-15 minutes
depending on the object brightness. The observations were complemented
by standard star flux measurements (Oke [1990], Bohlin [1996]),
reference spectra (Hg-Cd lamp) for wavelength calibration, dome flat,
bias and dark frames.
Most of the time the weather conditions were photometric
with a seeing
1.5 (FWHM). Only during two nights
the weather conditions were variable with a seeing of
3 - 4(FWHM). The measurements of these nights are
marked by ``*'' in Table 4.