Filters

Camera filter wheel

MES-AT contains a filter unit with 3 filter stacks each with an optically free diameter of 50mm. The use of the filters is to isolate the observed waveband therefore cross-dispersion is not applied to this spectrometer.

Aristarchos filters for MES-AT

Emission line filters

Emission line CWL (Å) BW (Å) T max (%) Diameter (mm)
[O II] 3726+ [O II] 3729 3740 30 76.86 50
Ca II 3934+HeI 3926 3940 35 84.13 50
He II 4686 4700 40 72.97 50
Ηβ4861 4870 50 86.11 50
[O III] 5007 5000 60 90.80 50
[O III] 5007 5020 50 82.47 50
He I 5914 5920 60 83.91 50
[OI]6300 6320 80 83.91 50
Hα+[NII] 6548, 6583 6580 100 88.42 50
Hα+[NII] 6548, 6583 6580 100 88.78 50
[SII]6717+6731 6760 100 87.33 50
[SII]6717+6731 6800 100 87.50 50