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9
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vol 63 / September, 2020
Article

DOI 10.17586/0021-3454-2017-60-1-53-62

UDC 524.523, 535-4

STELLAR SPECTROPOLARIMETRY WITH THE 6-M TELESCOPE BTA. II. PRIMARY FOCUS ECHELLÉ SPECTROGRAPHS

V. E. Panchuk
Special Astrophysical Observatory of RAS; Chief Researcher; ITMO University, Department of Department of Infocommunication Technologies in Astrophysics and Аstroinstrument Engineering;; Dr. Sci., Professor


V. G. Klochkova
Special Astrophysical Observatory of RAS; Head of Laboratory


M. V. Yushkin
Special Astrophysical Observatory of RAS; Senior Scientist


G. V. Yakopov
Special Astrophysical Observatory of RAS, BTA Technical Support Team, Nizhniy Arkhyz, Karachai-Cherkessian Republic; Senior Scientist


Y. B. Verich
Special Astrophysical Observatory of RAS; Senior Engineer


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Abstract. The Echelle spectrograph PFES and a new-generation spectrograph ESPRI developed by considering the last achievements in optics and electronics are presented. In the new primary focus spectrograph for the BTA, diameter of the collimated beam, the echelle blaze angle, the lens focal length, and the CCD format are enhanced. Each of the ESPRI parameters (spectral resolution, the length of the concurrently measured spectral range, penetrating power) is at least twice as large as that for the PFES spectrometer. In spectroscopy mode, the spectral resolution is R=30 000, in the measurement mode for linear and circular polarization R=20 000. The new device enables fast transformation of the Spectro-polarimeter into the spectrograph, and vice versa. Schemes of the spectrographs PFES and ESPRI and presented, their characteristics are analyzed. Examples of echelle-spectra images are demonstrated.
Keywords: large telescope, spectrograph, polarization analyzer, CCD, Stokes parameters, spectra of stars

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