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Дата изменения: Wed Apr 14 14:21:19 1999 Дата индексирования: Sat Sep 11 20:28:58 2010 Кодировка: Поисковые слова: annular |
All results presented below were obtained by observations with the Russian
6m telescope, mainly in the snap-shot mode during 16 runs
between December 1995 and June 1998. The spectrograph SP-124 attached to
the Nasmyth-1 focus of the telescope and equipped with a new Photometrix
CCD-detector PM1024 (with
m pixel size) was used in most
of the runs. We used the gratings either with 300 grooves/mm or with 600
grooves/mm (see journal of observations in Table 1). Due to an experimental
set-up of the CCD detector, it was not properly optimized, and significant
vignetting prevented us in several runs in 1995 and early 1996 to get
spectra in the UV (
Å). Various spectral set-ups
were used with dispersions from 2.4 to 5.5 Å/pixel.
The long slit with a length of 40
was used. The slit width was
2
in almost all observations. The scale along the slit was
0.4
or 0.5
/pixel.
Normally, short exposures were used (2-5 minutes) in order to detect
strong emission lines, to measure redshifts and make some crude
classification.
Several spectra were taken with the Long Slit spectrograph (LSS in Table 1)
(Afanasiev et al. [1995])
at the 6m telescope prime focus equipped with a CCD-detector on base of
an ISD015A chip (
pixels, with rectangular pixel size
m), produced at SAO RAS. Long slit spectra
(
)
were obtained with the grating having 650
grooves/mm and a dispersion 3.1 Å/pixel, and a scale along the slit
of 0.41
/pixel.
Reference spectra of an Ar-Ne-He lamp were recorded before or after
each observation to provide a wavelength calibration.
The spectrophotometric standard stars from Massey et al. ([1988])
were observed for flux calibration at least twice a night.
All observations and data aquisition with the spectrograph SP-124 have been conducted under software package NICE in MIDAS, described by Kniazev & Shergin (1995).