15 juin 2010
Neon stuff
The LhiresIII spectrograph has a built-in neon lamp for calibrating stellar spectrum. Taking one neon spectra before and after stellar exposition is highly recommended in high resolution spectrography cause of the mechanical instability of this "at telescope focus" slit spectrograph. Here is an illustration of the mechanical effect on the shift of the band pass of the neon spectrum.
" Dérive de la bande passante du LhiresIII sur un spectre du néon avec en haut une rotation de 180° en Dec, en bas une rotation de 90° en Ra... [Lire la suite]