Hello,
After some observation gap, I've tried my new ATIK 428 EXm camera in the UV with LHIres III 2400/mm grating in order to continue my serie at the same resolution like I have had in 2015 and 2016 autumn:
viewtopic.php?f=19&t=1233&start=20
Now I can clearly identify a non-shortterm big increase of many Fe absorptions:
(I regret not always including the complex 3859.911 Fe feature fully.)
I don't know for sure, but possibly the Fe notions in VSpec should be Fe I.
Based on 11 spectra - one from 2015 -, not seen any variance before on these lines.
Currently I hope it's not only an exceptional shortterm variation. To make sure, continuing my serie monthly if possible.
To see all my serie in the same range, here my all the relevant .fits, attaching "spectra_vhel_norm.zip" (helocentric correction was necessary) - at this moment I can't see anyone picking these up.
Cheers,
Peter
PS.: had to use a "black light bulb" as a flat for the 428 EXm (this camera flat requires special treatment), removing 3 emissions. But, I've checked and it doesn't have any correlation with the Fe lines.