Hamilton Spectrograph User's Guide: interactive Th-Ar

Hamilton Thorium-Argon Spectrum (Dewar 4)

The overexposed Argon lines at the top of the image are a necessary evil of the Th-Ar lamp. They may be partly suppressed by using a bg38 filter, but at the cost of also suppressing useful lines in the red.

Note that the image is shown here is windowed.

For orders and wavelengths of individual lines, refer to Lick Observatory Technical Report #73, The Hamilton Spectrograph TH-AR Atlas by M. D. Shetrone (it's a green, paperbound book, copies of which should be floating around in the 3-m and CAT control rooms).