LIRIS has two filter wheels (FW1, FW2), a slit wheel (SW), a grism
wheel (GW) and a pupil wheel (PW). The current configuration of each is
given below. Dummies in the wheels are not explicitly listed. Filters
in the filter wheels are inclined by 5 degrees in order to suppress
reflections in the image. The green
commands explain how to move a wheel
independently of the others.
The J, H, Ks, filters mounted in LIRIS were purchased from A.
Tokunaga's consortium, which is known as Mauna Kea Observatory system.
The transformation
between 2MASS and other photometric systems can be found
here.
Note: The mr_k grism for K is less efficient than expected.
Note: Coronagraphic mode has not yet been fully
characterised. It is not availble at present, since the coronagraphic
mask was removed to make space for a MOS mask, but it can be included
in the slit if telescope time is awarded.
| Filter wheel
configuration lfwheel[1|2] <filter name> |
| Filter name |
Wheel and Pos. |
Cut-on [μm] |
Cut-off [μm] |
Transmission |
| y |
FW2 - 11 |
0.976 |
1.062 |
cold
data |
| j |
FW2 - 10 |
1.170 |
1.330 |
cold
data |
| h |
FW2 - 5 |
1.490 |
1.780 |
cold
data |
| ks |
FW2 - 2 |
1.990 |
2.310 |
cold
data |
| z |
FW2 - 9 |
0.996 |
1.069 |
cold
data |
| jc |
FW1 - 12 |
1.216 |
1.244 |
cold
data |
| pabeta |
FW1 - 6 |
1.277 |
1.310 |
cold
data |
| hc |
FW1 - 11 |
1.558 |
1.582 |
cold
data |
| ch4 |
FW1 - 3 |
1.640 |
1.740 |
cold
data |
| fe2 |
FW1 - 5 |
1.632 |
1.656 |
cold
data |
| he1 |
FW2 - 6 |
2.043 |
2.073 |
cold
data |
| h2v10 |
FW1 - 10 |
2.106 |
2.138 |
cold
data |
| brg |
FW2 - 7 |
2.150 |
2.182 |
cold
data |
| h2v21 |
FW1 - 4 |
2.231 |
2.265 |
cold
data |
| kc |
FW2 - 12 |
2.253 |
2.287 |
cold
data |
| All above |
|
|
|
cold |
| hkspec |
FW2 - 3 |
1.4 |
2.5 |
warm data |
| ucm |
FW1
- 9 |
1.177 |
1.186 |
cold
|
| wdwspec |
FW1 - 1 |
- |
- |
Spectropolarimetry |
| clear |
FW1 - 8 |
- |
- |
- |
| clear |
FW2 - 4 |
- |
- |
- |
|
| Slit wheel
configuration lslit <slit mask name> |
| Slit mask name |
Wheel |
Type |
Width |
Remarks |
| l0p65 |
SW - 1 |
Long slit |
0.65" |
|
| l0p75 |
SW - 2 |
Long slit |
0.75" |
|
| l1 |
SW - 3 |
Long slit |
1.0" |
|
| lext6 |
SW - 4 |
Long slit |
0.75" |
6 slits with increasing
offsets (maximum 450 pixel) in dispersion
direction, for much greater spectral coverage. |
| l2p5 |
SW - 5 |
Long slit |
2.5" |
|
| l5 |
SW - 14 |
Long slit |
5.0" |
|
| l10 |
SW - 6 |
Long slit |
10.0" |
|
| various |
SW - 8,10,11,15 |
Multi slit masks |
- |
|
| l0p75f0p25 |
SW - 7 |
- |
- |
|
| clear0p25 |
SW - 12 |
- |
- |
|
| clear |
SW - 13 |
- |
- |
Clear aperture |
| blank |
SW - 9 |
- |
- |
Blocked light path |
|
| Grism wheel
configuration lgrism <grism name> [<slit name>] |
| Grism name |
Wheel and Pos. |
Wavelength |
Resolution |
Remarks |
| lr_zj |
GW - 8 |
z - J |
R = 700 |
|
| lr_hk |
GW - 2 |
H - K |
R = 700 |
|
| mr_k |
GW - 6 |
K |
R = 2500 |
Low efficiency |
| hr_j |
GW - 3 |
J |
R = 2500 |
|
| hr_h |
GW - 1 |
H |
R = 2500 |
|
| hr_k |
GW - 7 |
K |
R = 2500 |
|
| wdw_image |
GW - 9 |
- |
- |
Imaging polarimetry |
| clear |
GW - 10 |
- |
- |
Clear aperture |
|
| Pupil wheel
configuration lpupil <pupil name> |
| Pupil name |
Wheel and Pos. |
Purpose and
remarks |
| pshortbr |
PW - 1 |
Short
wavelength, broad band filters; lr_zj grism; |
| pcblnkxl |
PW - 2 |
Long
wavelength, broad band; lr_hk grism; 10mm shield for M2 |
| plongmd |
PW - 3 |
Long
wavelength, medium band filters |
| pcoron |
PW - 4 |
Coronagraphic
mode |
| phdhart |
PW - 6 |
Hartmann mask |
| pshortbru |
PW - 7 |
2% smaller area
than pshortbr |
| pcblnk |
PW - 8 |
Like pcblnkxl,
but with 8.83mm shield for M2 |
| plongmidu |
PW - 9 |
2% smaller than
plongmd |
| pcentnr |
PW - 11 |
Narrow band
filters |
| pvdhart |
PW - 12 |
Hartmann mask |
| clear |
PW - 5 |
Clear aperture |
| blank |
PW - 10 |
Blocked light
path |
|
