An on-line Thorium Argon spectral atlas is now available from the NOAO home page under NOAO Services. Click on Data Archives or go to http://www.noao.edu/kpno/tharatlas/. The atlas consists of one long data file from which any wavelength interval can be viewed or the whole spectrum can be obtained as a FITS file. A line list is also given with each plot or the whole list can be obtained.
This new atlas, obtained with the echelle grating on the KPNO coudé spectrograph, improves upon the older (1987) ThAr atlas in increased wavelength coverage, higher resolution, and more line identifications. The spectral lines are labeled according to ion.
Future developments will include FeAr, CuAr, and HeNeAr atlases.
Daryl Willmarth, Matt Cheselka, Mike Fitzpatrick