Thorium-Argon Atlas

Purpose of the Atlas

This page provides an atlas of UVES Thorium-Argon spectra as obtained in the UVES standard settings.
The atlas can be used to identify individual Thorium-Argon lines to generate wavelength calibration solutions.
In addition, the FITS table with the wavelengths of the Thorium-Argon lines is provided.

Content of the Atlas

  • 2D images of the Thorium-Argon frames with
    • the instrument setup identified on the top,
    • the running number of the (extracted) orders to the left,
    • the absolute order numbers to the right.
  • plots of all extracted 1D orders with
    • the extracted order numbers, the absolute order numbers, and the instrument setups identified on the top,
    • the extracted Thorium-Argon spectra in x-pixel coordinates
    • the lines identified by their wavelength (in blue)
  • resolution plots as derived from the extracted Thorium-Argon spectra

Background information

  • The Thorium-Argon exposures have been taken with the following instrument settings:
    • slit width: 0.5 arcsec
    • exposure time: 15 s
    • CCD setup: readout-speed 225kHz, low gain, 1x1 binning
  • The CCD frames have been extracted and flipped/transposed with theSPLIT/UVES tool available in the MIDAS context uves:
    • the overscan regions are removed
    • the orders are oriented to have a positive slope
    • wavelengths are increasing from bottom to top

Download section

Thorium-Argon linetable in FITS-table and ASCII formats.
This linetable contains in computer readable form all Thorium-Argon lines which are identified in the atlas.
The Thorium linelist is based onPalmer, B. A., & Engleman, R. Jr. 1983, Atlas of the Thorium spectrum,Sinoradzky H. (ed.), Los Alamos National Laboratory,
and lines are selected according to R=100000 spectroscopy based onde Cuyper, J.-P., & Hensberge, H. 1998, A&AS, 128, 409.
For the Argon lines, the reference isNorlén, G. 1973, Phys. Scripta, 8, 249.
The table has been edited to provide blend-free lines for a resolving power of R=100000. In the near-IR, lines have been added to improve the dispersion solutions.

Echelle CD wave atlas file
Blue #1 346nm
Blue #2 390nm
Blue #2 437nm
Red #3 520nm
Red #3 564nm
Red #3 580nm
Red #4 860nm