Reduction of CCD observations made with a scanning Fabry--Perot interferometer. III. Wavelength scale refinement

TL;DR

This paper presents improved data reduction techniques for scanning Fabry-Perot interferometer observations, enabling accurate wavelength calibration despite large object offsets, and discusses the parameters of the FPI used in the SCORPIO-2 instrument.

Contribution

It introduces modifications to the data reduction process that correct wavelength scale calculations for large offsets in interferograms, enhancing observational accuracy.

Findings

Enhanced wavelength calibration accuracy for large offsets

Detailed parameters of the SCORPIO-2 FPI

Improved data reduction methodology

Abstract

We describe the recent modifications to the data reduction technique for observations acquired with the scanning Fabry-Perot interferometer (FPI) mounted on the 6-m telescope of the Special Astrophysical Observatory that allow the wavelength scale to be correctly computed in the case of large mutual offsets of studied objects in interferograms. Also the parameters of the scanning FPIs used in the SCORPIO-2 multimode focal reducer are considered.