Daryl W Willmarth
Michael Fitzpatrick
National Optical Astronomy Observatory
950 N Cherry Avenue
P.O. Box 26732
Tucson, AZ 85726-6732
The CuAr spectrum is used mainly for low to intermediate resolution spectroscopy as a wavelength source for dispersion solutions.

These spectra were obtained with the KPNO 2.1 m coude spectrograph configured with grating "B", camera 5, and the T2KB (2048 x 2048 pixels) CCD. First, second and third orders were used yielding resolutions of 0.70 A/pix, 0.35 A/pix, and 0.23 A/pix respectively.

Wavelengths for the few lines of Cu are from THE MIT Wavelength Tables (1969) and Ar from Norl'en (1973). Dispersion solutions were fit to the spectra with the IRAF IDENTIFY task using Legendre polynomials of order 3 - 5. The rms fit was typically about 0.1 pixel per line. The atlas consists of one long data file covering the wavelength region from 3000A to 10900A. A list of the lines shown here may be found in the IRAF noaolib$linelists directory. Since most of the lines are from Ar, only the few Cu lines are labeled under Line Identity.

After selecting a wavelength range, click on the 'Get Spectrum' button; a plot and line list will appear. The user has the option of displaying the plot, the line list, or both. There is also a downloading section where the unlabeled FITS data and the plot in Postscript format is available. Line wavlengths on the latter format will likely be much more easily read than on the browser plot.

This main page also makes available the entire Atlas and Line List to be downloaded directly. (use Right Mouse Button to Save to Disk)

Choose a Wavelength Range and Display Options
(3000Å to 10900Å, no commas please)
Start Wavelength: End Wavelength:
Max Num Lines: Show Plot Show List

References The MIT Press, 1969.
Norlén, G. 1973, Physica Scripta, 8, 249.