objectlist
NIR polarimetry standard stars -project
Afternoon
Dome flats (at zenith or dome flat position)
SYS>lipol ks
SYS>agmirror out
SYS>petals open
SYS>fflamp 1 on
SYS>fflamp 2 on
Put manually a retarder plate LIR-HWPPAR using GUI.
Check exposure time.
SYS>run liris 1.5 "exp test"
keep the maximum counts less than 20 000.
Here I use 1.5s as exposure time, but change it accordingly to your successful
test exposure.
SYS>hwflats.bsh 1.5 Dome_pol_Ks_bright ; bell
SYS>fflamp all off
Use the same exposure time for both bright and dim flats.
SYS>hwflats.bsh 1.5 Dome_pol_Ks_dim ; bell
Above example is for Ks but take also J, H, z and Y. No need to take separate
dim flats for these filters.
Twilight
No need for sky flats.
At night
No seeing limit, Airmass 2 or less (with exeption of two targets that never go so high), sky has to be clear.
Observe the following stars (or any subset)
| Star name | RA (J2000) | DEC (J2000) | K | H | J | Y | z |
BD+64 106 | 00 57 36.7 | +64 51 26 | | | | | |
| TYC4034-1216-1 | 01 24 40.43 | +63 08 29 | | | | | |
| BD+61 370 | 02 03 37.12 | +62 03 56.7 | | | | | |
| BSD9-61 | 03 08 41.9 | +59 10 53 | | | | | |
| BD+56 866 | 03 59 28.89 | +57 07 04.9 | | | | | |
| HDE 279658 | 04 17 06.6 | +37 16 55.3 | 8.40 | | | | |
| HDE 279652 | 04 18 10.4 | +37 43 11.4 | 8.74 | | | | |
| HDE 283637 | 04 25 58.9 | +27 37 01.4 | 9.19 | | | | |
| Elias3-29 | 04 37 15.1 | +25 17 30 | * | * | * | | |
| HD 283809 | 04 41 24.72 | +25 54 48.5 | 6.17* | * | * | | |
| HDE 283800 | 04 43 27.3 | +27 01 37.0 | 8.69 | | | | |
| HDE 283855 | 04 48 12.7 | +27 01 47.8 | 9.22 | | | | |
| HD283879 | 04 48 14.30 | +25 11 43.5 | * | | | | |
| NGC2024-1 | 05 41 37.85 | -01 54 36.5 | * | * | * | | |
| HD290862 | 05 46 43.30 | +00 04 35.8 | | * | | | |
| HD251204 | 06 05 05.67 | +23 23 38.5 | | | | | |
| HRW24 | 07 04 47.40 | -10 56 18.0 | | | | | |
| HD162061 | 17 49 33.89 | -11 53 56.3 | | | | | |
| BD-12 5133 | 18 40 01.7 | -12 24 06.9 | | | | | |
| R Cra #58 | 19 01 14.4 | -37 26 01.3 | 6.90 | * | * | ! | ! |
| R Cra #15 | 19 05 12.5 | -37 29 15.8 | 10.91 | ! | ! | ! | ! |
| Cyg OB2 No.3 | 20 31 37.5 | +41 13 21.1 | 5.75* | * | * | * | |
| Cyg OB2 A | 20 32 31.5 | +41 14 08 | * | * | * | | |
| BD+57 2465 | 22 09 20.87 | +57 51 28.4 | | | | | |
| HD215806 | 22 46 40.2 | +58 17 43.9 | 8.08* | * | | | |
* With decent seeing one needs to defocus a bit.
! These have no data so far. Put higher on the list if possible. Very low, look at the visibility and optimize.
SYS>lipol ks
Point to the target.
SYS>lobject_impol <x> <y>
where x and y are the coordinates of the star on the detector (you will see 4 times the same field, choose the star on the second from top). This will move the
star to the pre-defined position on the detector.
Again test the peak counts with using LIR-HWPPAR in the beam, aim for less than 20k.
SYS>run liris 1 "exposure time test"
Here 1s is the expsosure time
SYS>hw2_nod5_pol 1 -ncyc=3 -jitter=2 -clean=9
Report the file names for instrument specialist (rk).
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