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NES
Nasmyth Echelle Spectrograph (NES)
The echelle spectrograph NES located at the Nasmyth-2 focus (1:30)
platform of the 6-m telescope is a part
of the spectral complex ( MSS ,
LYNX , NES) having a common control.
Development of the echelle spectrograph NES was performed in the
framework of the
SAO-programme "Modernization of the 6-m telescope".
This spectrograph was designed by
V.E. Panchuk,
V.G. Klochkova,
I.D. Najdenov
and Prof. N.E. Piskunov (Uppsala University).
Optical elements were produced mainly at the Vavilov Optical
Institute and the Optic-Mechanical Corporation, St.Petersbourgh.
This spectrograph provides a spectral resolution R=60000.
Its optical layout (without preslit devices) is presented
here .
The preslit devices are presented
here .
The focal length of the collimator is F=7200mm. The diameter of the
collimated beam is d=240mm.
The mosaic R2 echelle 600x300mm, 37.5 gr/mm is used in
the quasi autocollmation mode.
The gratings for cross dispersion have 300 and 600 gr/mm, the blazed area
is 320x360mm.
The Schmidt-Cassegrain camera's focal length is F=600mm, the diameter of
the correction plate is D=305mm. Whole camera's optics, including
double-pass back alluminated Cassegrain menisc, is made from fused silica.
The diameter of the flat field of this camera is about 40mm.
The first light of the NES was obtained with the CCD 1040x1160 pixels,
with the pixel size 16x16mkm. This CCD was developed by the
ADL SAO.
In July 2001 the large
CCD 2050x2050 producted in Denmark was installed at the
NES. The CCD works inside the LINUX
environment under the software BIAS developed in Copenhagen
University Observatory, Denmark.
We present here some spectra obtained at the 6m telescope
using the spectrograph NES in combination with a CCD 2050x2050:
high resolution, R=60000, spectrum of
subdwarf G27-44 (B=8.0) in the blue spectral range 3500-5000 AA
and
high resolution, R=60000, spectrum of
peculiar star HD4778
obtained in the spectral range 4700-6100 AA with a Zeeman analyzer.
The description of NES
(PostScript-file, in Russian) is applied. Besides, some details
of the construction and results of a testing are published in the
SAO Preprints, 1999, N135, 137 and 138.
The results of adaption of a large "Uppsala" CCD 2048x2048 pixels
are presented by Panchuk V.E., Piskunov N.E., Klochkova V.G., Yushkin M.V. and Ermakov S.V.
in the SAO Preprint N169, 2002 (in Russian).
There are positional, photometric parameters of the spectrometer, the parameters
of the echelle frame, the sample of observations, etc.
Recent full description of the spectrograph NES is pesented in the paper
by V.Panchuk, V.Klochkova, M.Yushkin & I.Najdenov.
Journal Optical technology, 2009, v.76, p.87.
