GIRAFFE Low Resolution grating settings OLD focussing
These are the values as of before the intervention on February 2nd 2015, i.e. they are valid only for observations before that date. Note, however, that these are nominal values. The actual resolving powers are probably lower than these values before the intervention, as there was a slow decrease in spectral resolution since 2010. This was solved with the intervention and the resolving powers are now stable. For more details see the News section. From P84 in ARGUS/GIRAFFE, the setting LR01 is available in VISITOR MODE ONLY due to the problem of obtaining sufficient counts in blue attached flats. For Medusa and IFU all settings are available in service and visitor mode.
| Filter | Theta | Order | p2pp name | ETC name | Wl start | Wl center | Wl end | Band | R IFU/Argus | R MEDUSA |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 32.4 | 5 | L385.7 | LR1 | 362.0 | 385.7 | 408.1 | 46.1 | 12800 | 8000 |
| 2 | 27.9 | 4 | L427.2 | LR2 | 396.4 | 427.2 | 456.7 | 60.3 | 10200 | 6400 |
| 3 | 32.2 | 4 | L479.7 | LR3 | 450.1 | 479.7 | 507.8 | 57.8 | 12000 | 7500 |
| 4 | 26.3 | 3 | L543.1 | LR4 | 501.5 | 543.1 | 583.1 | 81.6 | 9600 | 6000 |
| 5 | 30.6 | 3 | L614.2 | LR5 | 574.1 | 614.2 | 652.4 | 78.3 | 11800 | 7400 |
| 6 | 34.9 | 3 | L682.2 | LR6 | 643.8 | 682.2 | 718.4 | 74.6 | 13700 | 8600 |
| 7 | 24.7 | 2 | L773.4 | LR7 | 710.2 | 773.4 | 834.3 | 124.0 | 8900 | 5600 |
| 8 | 29.0 | 2 | L881.7 | LR8 | 820.6 | 881.7 | 940.0 | 119.0 | 10400 | 6500 |
Legend
- Filter is the filter number;
- Theta is the angle of diffraction with the grating normal;
- Order is the working echelle order;
- Wl star, center, end are the wavelengths at the edges and center of the CCD;
- Band is the covered spectral passband;
- resolving power, R, obtained in IFU/Argus mode;
- resolving power, R, obtained in MEDUSA mode.