K type stars show an intimidating number of atomic lines in their spectra and are not good objects for low resolution spectroscopy using the Star Analyser. Nevertheless, I have tried to resolve some multiplets of the alkali and alkaline earth metals in the spectrum of Algieba (gamma Leonis). Surprisingly, the resolution in the UV and NIR region was quite good (around 10 A; the Bayer colour filter array of my colour camera Canon EOS 450 Da becomes transparent in these regions) and this allowed to partially resolve some of the Fe I multiplets in the UV:
Fe I shows an extremely complex spectrum with many lines as illustrated already by a partial (!) Grotrian diagram :
The notation used for the terms in this diagram is quite different form the terms used in the Grotrian diagrams of the alkali and alkaline earth metals, and I had to consult the primary literature. A very helpful publication is “A new muliplet table for Fe I” http://adsabs.harvar...ApJS...94..221N together with the NBS technical note “A multiplet table of astronomical interest” https://play.google....=de&pg=GBS.PA13. This has allowed to fully assign the Fe I multiplet no. 43 with its satellites between the G band and the Ca II doublet:
Of course, high resolution spectra show that most of these multiplets are actually complex blends with lines of other elements and molecules, but it is a nice exercise for cloudy nights in the Corona lock-down. One question remains to be answered: why did the authors used the old written German letter “z” for the notation of some selected terms in the Fe I Grotrian diagram? Perhaps as a reminiscence for the German scientist Grotrian? In the newer diagrams the old written "z" is replaced with the usual "z".