Configuration

LIRIS filters, grisms, prisms, slits and pupils

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.

Note: The R=2500 grism for K appears less efficient than expected. It might be replaced by a different grism.

Note: Coronographic mode has not yet been fully characterised. It is not availble in 2007A, since the coronographic mask was removed to make space for a MOS mask.


Applying for time	Object visibility
Archive	Observing logs
Conferences and meetings	Site quality
Publications	Schedules
[INGNEWS]	Studentship programme
Isaac Newton Telescope	Time allocations
William Herschel Telescope	Weather and seeing

Developments

Public Information

Home > Astronomy > LIRIS > Configuration



Filter wheel configuration `lfwheel[1\|2] <filter name>`

Filter name	Wheel and Pos.	Cut-on [μm]	Cut-off [μm]	Transmission

z	FW2 - 9	0.996	1.069	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
brg	FW2 - 7	2.150	2.182	cold data
kc	FW2 - 12	2.253	2.287	cold data
hc	FW1 - 11	1.558	1.582	cold data
jc	FW1 - 12	1.216	1.244	cold data
fe2	FW1 - 5	1.632	1.656	cold data
pabeta	FW1 - 6	1.277	1.310	cold data
h2v10	FW1 - 10	2.106	2.138	cold data
h2v21	FW1 - 4	2.231	2.265	cold data
ch4	FW1 - 3	1.640	1.740	cold data
he1	FW2 - 6	2.043	2.073	cold data
hkspec	FW2 - 3	1.4	2.5	warm data
ucm	FW1 - 9	1.177	1.186	cold ucm is a private filter. Contact Jesus Gallego before using it.

wdwspec	FW1 - 1	-	-	Spectropolarimetry
clear	FW1 - 8	-	-	-
clear	FW2 - 4	-	-	-





Slit wheel configuration `lslit <slit mask name>`

Slit mask name	Wheel and Pos.	Type	Width	Remarks

l0p65	SW - 3	Long slit	0.65"
l0p75	SW - 4	Long slit	0.75"
l1	SW - 5	Long slit	1.0"
l0p75ext	SW - 6	Long slit	0.75"	Offset of 100 pixels between lower and upper half of the slit in dispersion direction, for greater spectral coverage.
l5	SW - 7	Long slit	5.0"

various	SW - 1, 2, 8, SW - 10, 13, 14	Multi slit masks	-

l0p75f0p25	SW - 9	-	-
patron 900	SW - 16	-	-	Pinhole mask
clear0p25	SW - 12	-	-
clear	SW - 15	-	-	Clear aperture
blank	SW - 11	-	-	Blocked light path





Grism wheel configuration `lgrism <grism name> [<slit name>]`

Grism name	Wheel and Pos.	Wavelength	Resolution	Remarks

lrhk12tl10	GW - 1	H - K	R = 700	Inclination angle: 10° don't use
lrhk	GW - 2	H - K	R = 700	Inclination angle: 0°
lrzj8	GW - 7	z - J	R = 700	Inclination angle: 0°
lrzj9tl5	GW - 8	z - J	R = 700	Inclination angle: 5° don't use
mrk	GW - 10	K	R = 2500	Inclination angle: 0°

wdw_image	GW - 6	-	-	Imaging polarimetry
clear	GW - 9	-	-	Clear aperture





Pupil wheel configuration `lpupil <pupil name>`

Pupil name	Wheel and Pos.	Purpose and remarks

pshortbr	PW - 1	Short wavelength, broad band filters; lrzj8 grism;
pcblnkxl	PW - 2	Long wavelength, broad band; lrhk grism; 10mm shield for M2
plongmd	PW - 3	Long wavelength, medium band filters
pcoron	PW - 4	Coronographic 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


	Last Updated: 11 Jan 2007 Mischa Schirmer ( )