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. It has been replaced by a different grism
(test pending).
Note: Coronographic mode has not yet been fully characterised. It is not availble at present, since the coronographic
mask was removed to make space for a MOS mask, but it can be included in the slit if telescope time is awarded.
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Filter wheel configuration lfwheel[1|2] <filter name> |
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Filter name |
Wheel and Pos. |
Cut-on [μm] |
Cut-off [μm] |
Transmission |
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y |
FW2 - 11 |
0.976 |
1.062 |
cold data |
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j |
FW2 - 10 |
1.170 |
1.330 |
cold data |
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h |
FW2 - 5 |
1.490 |
1.780 |
cold data |
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ks |
FW2 - 2 |
1.990 |
2.310 |
cold data |
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z |
FW2 - 9 |
0.996 |
1.069 |
cold data |
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jc |
FW1 - 12 |
1.216 |
1.244 |
cold data |
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pabeta |
FW1 - 6 |
1.277 |
1.310 |
cold data |
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hc |
FW1 - 11 |
1.558 |
1.582 |
cold data |
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ch4 |
FW1 - 3 |
1.640 |
1.740 |
cold data |
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fe2 |
FW1 - 5 |
1.632 |
1.656 |
cold data |
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he1 |
FW2 - 6 |
2.043 |
2.073 |
cold data |
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h2v10 |
FW1 - 10 |
2.106 |
2.138 |
cold data |
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brg |
FW2 - 7 |
2.150 |
2.182 |
cold data |
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h2v21 |
FW1 - 4 |
2.231 |
2.265 |
cold data |
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kc |
FW2 - 12 |
2.253 |
2.287 |
cold data |
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All above |
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cold |
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hkspec |
FW2 - 3 |
1.4 |
2.5 |
warm data |
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ucm |
FW1 - 9 |
1.177 |
1.186 |
cold
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wdwspec |
FW1 - 1 |
- |
- |
Spectropolarimetry |
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clear |
FW1 - 8 |
- |
- |
- |
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clear |
FW2 - 4 |
- |
- |
- |
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Slit wheel configuration lslit <slit mask name> |
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Slit mask name |
Wheel |
Type |
Width |
Remarks |
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l0p65 |
SW - 1 |
Long slit |
0.65" |
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l0p75 |
SW - 2 |
Long slit |
0.75" |
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l1 |
SW - 3 |
Long slit |
1.0" |
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lext6 |
SW - 4 |
Long slit |
0.75" |
6 slits with increasing offsets (maximum 450 pixel) in dispersion
direction, for much greater spectral coverage. |
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l2p5 |
SW - 5 |
Long slit |
2.5" |
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l5 |
SW - 14 |
Long slit |
5.0" |
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l10 |
SW - 6 |
Long slit |
10.0" |
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various |
SW - 8,10,11,15 |
Multi slit masks |
- |
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l0p75f0p25 |
SW - 7 |
- |
- |
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clear0p25 |
SW - 12 |
- |
- |
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clear |
SW - 13 |
- |
- |
Clear aperture |
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blank |
SW - 9 |
- |
- |
Blocked light path |
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Grism wheel configuration lgrism <grism name> [<slit name>] |
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Grism name |
Wheel and Pos. |
Wavelength |
Resolution |
Remarks |
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lr_zj |
GW - 8 |
z - J |
R = 700 |
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lr_hk |
GW - 2 |
H - K |
R = 700 |
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mr_k |
GW - 6 |
K |
R = 2500 |
Low efficiency |
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hr_j |
GW - 3 |
J |
R = 2500 |
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hr_h |
GW - 1 |
H |
R = 2500 |
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hr_k |
GW - 7 |
K |
R = 2500 |
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wdw_image |
GW - 9 |
- |
- |
Imaging polarimetry |
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clear |
GW - 10 |
- |
- |
Clear aperture |
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Pupil wheel configuration lpupil <pupil name> |
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Pupil name |
Wheel and Pos. |
Purpose and remarks |
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pshortbr |
PW - 1 |
Short wavelength, broad band filters; lr_zj grism; |
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pcblnkxl |
PW - 2 |
Long wavelength, broad band; lr_hk grism; 10mm shield for M2 |
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plongmd |
PW - 3 |
Long wavelength, medium band filters |
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pcoron |
PW - 4 |
Coronographic mode |
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phdhart |
PW - 6 |
Hartmann mask |
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pshortbru |
PW - 7 |
2% smaller area than pshortbr |
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pcblnk |
PW - 8 |
Like pcblnkxl, but with 8.83mm shield for M2 |
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plongmidu |
PW - 9 |
2% smaller than plongmd |
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pcentnr |
PW - 11 |
Narrow band filters |
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pvdhart |
PW - 12 |
Hartmann mask |
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clear |
PW - 5 |
Clear aperture |
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blank |
PW - 10 |
Blocked light path |
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