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 the
SPLIT/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 on Palmer, 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 on de Cuyper, J.-P., & Hensberge, H. 1998, A&AS, 128, 409.
For the Argon lines, the reference is Norlén, 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 | ThArB346.ps.gz |
| Blue | #2 | 390nm | ThArB390.ps.gz |
| Blue | #2 | 437nm | ThArB437.ps.gz |
| Red | #3 | 520nm | ThArR520.ps.gz |
| Red | #3 | 564nm | ThArR564.ps.gz |
| Red | #3 | 580nm | ThArR580.ps.gz |
| Red | #4 | 860nm | ThArR860.ps.gz |