Echelle spectrometer
LYNX
The echelle-spectrometer LYNX is a part of the spectral complex
( NES ,
MSS , LYNX)
having a common control located at the Nasmyth-2 focus platform of
the 6-m telescope.
The echelle spectrometer LYNX is designed and assembled by
LSS SAO .
Optical elements were produced mainly at the Vavilov Optical State
Institute, St.Petersbourgh.
The optical layout
(without its preslit devices) is presented
here .
The preslit devices are presented
here .
The focal length of the
collimator is F=3074mm, the collimated beam d=100mm.
The echelle gratings of 37.5 gr/mm and 75 gr/mm, the blaze angle
64.3 grad and blazed area 300x200mm are used.
The gratings for cross dispersion have 150, 300 and 600 gr/mm,
their blazed area is 145x145mm.
The Shmidt camera's focal length is F=387 mm, the camera's mirror diameter
is D=240mm, the diameter of the correction plate is D=210 mm.
The echelle spectrometer LYNX is equipped with the CCD (1040x1160 pixels,
the pixel size 16x16mkm) developed by
ADL SAO .
This spectrometer is intended for a spectroscopy of objects with
a high spectral resolution (R about 35000) in the wavelength
range 5000-9000 AA.
The number of spectral
orders registered simultaneously by the detector is determined by
the cross-dispersion grating.
The source of the comparison spectrum is a Th-Ar lamp.
The accuracy of radial velocity measurements
using the spectrograph is 0.1-0.2 km/s, while the equivalent width
measuring accuracy amounts to 5-6 %, for the line
equivalent widths in the interval 4-10 mA.
The CCD and image recording are controlled with a PC inside the
environment of OS Linux.
Echelle-spectra are available for users in FITS format.
More details you could find in the
description of LYNX
(PostScript-file, in Russian). Some details of the construction are
presented in the SAO Preprint, 1999, N139.
For consultations or other requests, please, contact with
Dr. Maksim Yushkin:
maks@sao.ru
