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MATRIX ECHELLE SPECTROMETER OF TERSKOL OBSERVATORY

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MAESTRO optical scheme

MAESTRO designed by F.A.Musaev. Spectrometer and CCD camera attached to the 2 metre "Karl-Zeiss-Jena" telescope of the Observatory on peak Terskol (3100 m, Northern Caucasus). The diameter of collimator beam is 200 mm. The accessible spectral range is ~3500 - ~10200 AA. The CCD camera and the data handling system, developed at SAO, consist of front-illuminated CCD device of 1024x1024 pixels (pixel size 16x16 mkm) inside a dewar, an electronic controller-interface and a IBM PC computer. MAESTRO offers different operational modes:

R=45 000 (~90 spectral orders, ~3500 - ~10200 AA registered simultaneously)
R=90 000 (~90 spectral orders, ~3500 - ~10200 AA, no overlapping)
R=190 000 (~45 spectral orders, ~3500 - ~10200 AA, no overlapping)

In picture (see below) seen the fragment of Solar spectrum obtained in dufferent observational modes and with different observational conditions (the depth of telluric lines (O₂) are unequal).

Solar spectrum in modes: R=45000, R=90000, R=190000

OBSERVATIONS AND DATA REDUCTIONS

The analysis of CCD data performed on the IBM PC compatible computers (AT386+) using the image and spectra processing system DECH developed by Galazutdinov G.A. (Special Astrophysical Observatory, Preprint #92, 1992). This system permits us to realize all the steps in echelle-spectra processing - dark current and background substraction, one-dimensional spectra extraction (particularly, by using the "optimal extraction" method (K. Horne, 1986, PASP, V.98, P.609), flat-field corrections, wavelength calibration, continuum placement and rectification, line identification, equivalent widths and radial velocity measuremnts. The system operates under MS-DOS and can be used with portable computer.