Service observations with ISIS
- Introduction
- ISIS default settings
- Offered observing modes
- Calibrations
1. Introduction
ISIS offers a wide variety of observing setups, as it allows the user to choose the central wavelengths, slit width, dichroic, on-chip binning, etc. In order to minimize the time invested on setup changes and acquisition of calibration frames during service observations, the number of setups offered is limited. Nevertheless, non-default settings are allowed if their need is scientifically justified in the service application.
Having a large database of observations using a limited set of ISIS setups will also allow us to keep an optimal quality control of the instrument that will benefit users.
The excluded modes of ISIS service observations include spectro- and imaging
polarimetry and the use of QUCAM CCDs.
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2. ISIS default settings
The following settings are the default for service observations:
- All data will be obtained in SLOW read-out mode.
- CCD window will be always "[585:1550,1:4200]" in both the BLUE and RED arms.
- Default on-chip binning is 1x1 in both arms.
- The new 5300 Bahr dichroic
will be always in place.
- The GG495 order sorting filter will be in the RED light path.
- The Red+
and EEV12
CCDs for the red and blue arm, respectively, will be in use.
Exceptions to these default settings will be considered if scientifically justified in the service proposal.
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3. Offered observing modes
The two tables below list the gratings and central wavelengths offered during service nights, along with spectral dispersions and wavelength ranges. Notice that the response of the system+dichroic should also be taken into account (wavelength ranges in parentheses).
|
ISIS red arm observing modes (with REDPLUS)
|
|
Grating
|
central
wavelength
|
Dispersion
(Å/mm)
|
Dispersion
(Å/pix)
|
Total Spectral
range (Å)
|
Unvignetted range
(2400 pixels)
|
50% unvignetted range
(3285 pixels)
|
|
R158R
|
7500
|
121
|
1.81
|
3735:11265 (5300:10000)
|
5294:9706 (5300:9706)
|
4481:10519 (5300:10000)
|
|
R316R
|
6450
|
62
|
0.93
|
4521:8379 (5300:8379)
|
5320:7580
|
4903:7997 (5300:7997)
|
|
R316R
|
8650
|
62
|
0.93
|
6721:10579 (6721:10000)
|
7520:9780
|
7103:10197 (7103:10000)
|
|
R600R
|
5900
|
33
|
0.49
|
4873:6927 (5300:6927)
|
5299:6501
|
5077:6723 (5300:6723)
|
|
R600R
|
7000
|
33
|
0.49
|
5973:8027
|
6399:7601
|
6177:7823
|
|
R600R
|
8200
|
33
|
0.49
|
7173:9227
|
7599:8801
|
7377:9023
|
|
R600R
|
9200
|
33
|
0.49
|
8173:10227 (8173:10000)
|
8599:9801
|
8377:10023
|
|
R1200R
|
5600
|
17
|
0.26
|
5072:6127 (5300:6127)
|
5291:5909
|
5177:6023 (5300:6023)
|
|
R1200R
|
6200
|
17
|
0.26
|
5672:6727
|
5891:6509
|
5777:6623
|
|
R1200R
|
6800
|
17
|
0.26
|
6272:7327
|
6491:7109
|
6377:7223
|
|
R1200R
|
7400
|
17
|
0.26
|
6872:7927
|
7091:7709
|
6977:7823
|
|
R1200R
|
8000
|
17
|
0.26
|
7472:8527
|
7691:8309
|
7577:8423
|
|
R1200R
|
8600
|
17
|
0.26
|
8072:9127
|
8291:8909
|
8177:9023
|
|
R1200R
|
9200
|
17
|
0.26
|
8672:9727
|
8891:9509
|
8777:9623
|
|
ISIS blue arm observing modes (with EEV12)
|
|
Grating
|
central
wavelength |
Dispersion
(Å/mm)
|
Dispersion
(Å/pix)
|
Total Spectral
range (Å)
|
Unvignetted range
(2820 pixels)
|
50% unvignetted range
(3670 pixels)
|
|
R158B
|
4500
|
120
|
1.62
|
1182:7817 (3200:5300)
|
2216:6784 (3200:5300)
|
1528:7472 (3200:5300)
|
|
R300B
|
4500
|
64
|
0.86
|
2730:6269 (3200:5300)
|
3282:5718 (3282:5300)
|
2915:6085 (3200:5300)
|
|
R600B
|
4000
|
33
|
0.45
|
3087:4912 (3200:4912)
|
3372:4628
|
3182:4818 (3200:4818)
|
|
R600B
|
4500
|
33
|
0.45
|
3587:5412 (3587:5300)
|
3872:5128
|
3682:5318 (3682:5300)
|
|
R1200B
|
3600
|
17
|
0.23
|
3130:4070 (3200:4070)
|
3277:3923
|
3179:4021 (3200:4021)
|
|
R1200B
|
4250
|
17
|
0.23
|
3780:4720
|
3927:4573
|
3829:4671
|
|
R1200B
|
4900
|
17
|
0.23
|
4430:5370 (4430:5300)
|
4577:5223
|
4479:5321
|
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Basic calibrations (biases, tungsten flats
and CuNeAr arcs) will be obtained by default for each observing setup used during the service night.
Other calibrations (flux standard, radial velocity standard, solar analogue stars, etc.) should be clearly described by the PI in the service proposal, also providing name, coordinates, finder chart, and any particular observing conditions). These extra calibrations will be charged to the total time requested.
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