NOAO
Daryl W Willmarth
Michael Fitzpatrick
National Optical Astronomy Observatories
950 N Cherry Avenue
P.O. Box 26732
Tucson, AZ 85726-6732

The FeAr hollow cathode spectrum can be useful at intermediate resolutions (e.g. lambda/dlambda = 5000 - 40000) as a wavelength comparison source. It has more intense lines in the blue than CuAr or HeNeAr, but is not as rich as ThAr.

These spectra were obtained with the KPNO 2.1 m coude spectrograph configured with grating "B", camera 5, and the F3KB (3072 x 1024 pixels) CCD. First, second and third orders were used yielding resolutions of 0.44 Å/pix, 0.22 Å/pix, and 0.14 Å/pix respectively.

The Fe wavelengths are from Crosswhite (1975) and the Ar from Norlén (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 0.01 Å. The atlas consists of one long data file covering the wavelength region from 3000Å to 10900Å. A list of the lines shown here may be found in the IRAF noaolib$linelists directory.

After selecting a wavelength range, click on the 'Get Spectrum' button. After several seconds, 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.

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
Crosswhite. H.M. 1975, Journal of Research of the National Bureau of Standards -- A, 79A, 17.
Norlén, G. 1973, Physica Scripta, 8, 249.