Spectral Resolutions

For any particular grating the spectral resolution depends on the fibre bundle as a consequence of the different fibre sizes. Table 3 lists the mean spectral resolution and linear dispersions for different gratings and bundle (reflexion mode). Note that due to the variation of the WYFFOS focus over the CCD (which affects the FWHM) the spectral resolution also changes over the CCD.

 

2400 g/mm 1200 g/mm 600 g/mm 316 300

Resolution (sb1) ($\AA$) 2.7 5.8 10.8 11.

Resolution (sb2) ($\AA$) 3.1 6.7 12.5 13.2

Resolution (sb3) ($\AA$) 6.2 13.5 25. 26.5

Linear dispersion ($\AA$/px) 1.4 3.07 5.7 6.

Spectral Coverage ($\AA$) 1445 3140 5837 6144 $*$Derived from calibration data with a mean PSF of 1.8 pixels, and $\lambda$_c=6000$\AA$