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DECH: A Software Package for Astronomical Spectral Data Processing and Analysis

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Abstract—The article provides a brief description of the software package DECH for processing and analysis of astronomical spectra. DECH supports all stages of processing and analysis of spectral data, including image preprocessing, spectra extraction (including those with a variable tilted slit), wavelength calibration by a two-dimensional polynomial, continuum normalization (manual or automatic), measurement of equivalent widths and radial velocities in various ways, cross-correlation analysis, etc. The DECH software package is actively used by astronomers from different countries and continues to be improved. In particular, utilities for processing and analysis of data from the high-resolution fiber-feed echelle spectrograph installed at 6-m telescope of Special Astrophysical Observatory of Russian Academy of Sciences were added in the latest version. Software provides high-precision measurements of radial velocities, including those for detection of extraterrestrial planets.

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Notes

  1. The program that can be freely distributed, available for download http://www.gazinur.com/Download.html. The installation instructions—http://www.gazinur.com/installation.html.

  2. https://www.eso.org/observing/etc/bin/gen/form?INS.NAME=UVES”.MODE=spectro.

  3. Option “Curve | Remove Telluric Lines” in the program DECH95.

  4. Procedure “Mask|Normalize apertures (Apnormalize)” in DECH95 program.

  5. Procedure “Mask | Create Mask” in the DECH95 program.

  6. Procedure “Mask | Edit” in the DECH95.

  7. Procedure “Extraction | Using mask…” in the DECH95.

  8. Procedure “Mask | Normalize Apertures (Apnormalize)…” in the DECH95.

  9. Dividing the images are performed in command line using FLATC or IMARITH programs.

  10.  Procedure “Mask | Solve Tilt Surface” in DECH95 program.

  11.  Оption “Fix the Tiltet Slit” in the procedure “Extraction | Using mask” in DECH95 program.

  12. Procedure “Curve | Dispersion Curve Workshop | Create It” in the DECH-FITS.

  13. Procedure “Curve | Dispersion Curve Workshop | Global Fit & Create FDS file” in DECH-FITS program.

  14.  Denoted as errOld in DECH-FITS program.

  15.  You can cut out an image fragment with the informative part using the trim 124 1633 266 1790 *.fits. The command is executed for all images until all subsequent processing steps. After installing the genuine spectrograph camera, this step can be skipped.

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Funding

The project was supported by the Ministry of Science and Higher Education of the Russian Federation, grant no. 075-15-2020-780.

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Authors and Affiliations

  1. Crimean Astrophysical Observatory, Russian Academy of Sciences, 298409, Nauchny, Russia

    G. A. Galazutdinov

  2. Special Astrophysical Observatory, Russian Academy of Sciences, 369167, Nizhnii Arkhyz, Russia

    G. A. Galazutdinov

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  1. G. A. Galazutdinov
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Correspondence to G. A. Galazutdinov.

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Translated by E. Porfiryeva

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Galazutdinov, G.A. DECH: A Software Package for Astronomical Spectral Data Processing and Analysis. Astrophys. Bull. 77, 519–529 (2022). https://doi.org/10.1134/S1990341322040034

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  • DOI: https://doi.org/10.1134/S1990341322040034

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