IRAF echelle spectra at last

Forums Spectroscopy IRAF IRAF echelle spectra at last

Dr Andrew Smith

Well after considerable procrastination on my part and with the help of the kind souls on the  SPEKTROSKOPIE  forum I have finally managed to extract 28 orders from my echelle spectrograms using IRAF. They are as yet un-calibrated in wavelength as I still need complete the mapping of the Th Ar lines to the orders ( more procrastination on my part).

I ran into one last obstacle when the spectral extraction crashed with an error “Polynomial separation too large” . Google only led to a very few links but I managed to hunt down a hidden parameter “polysep” and a reference to lowering it and by chance a hint to where it could be found.   Changing it fortunately fixed the problem… …phew.

The attached is the Th Ar spectrum from order 51 and matches that I got from Bass.

Regards Andrew