Open Access
Table 3.
Key parameters for the ZIMPOL subsystem.
| Observing modes | Imaging | Field stabilized or pupil stabilized |
|---|---|---|
| Polarimetry P1 | Instrument fixed (field and pupil rotating) | |
| Polarimetry P2 | Field stabilized | |
| Wavelength range | 510–900 nm | |
| Filters | 3 wheels | 6 broad band, 9 narrow band, 6 line, 3 neutral density filters |
| Detector modes | Imaging | High gain 10.5 e−/ADU |
| Fast polarimetry | Modulation 968 Hz, high gain 10.5 e−/ADU | |
| Slow polarimetry | Modulation 27 Hz, low gain 1.5 e−/ADU | |
| Detectors | e2v CCD 44-82 | Frame transfer CCD |
| Image area | 1024 × 1024 pix | Binned pixels with stripe mask |
| Detector field | ≈3.6 × 3.6″ | Same field for both detectors |
| System field | 8″ diameter | Accessible with field offsets |
| Pixel size | 3.6 × 3.6 mas | Illumination of every second row only |
| Full well | 670 ke− pix−1 | For high gain (fast polarimetry and imaging) |
| Shortest DIT | 1.1 s | For imaging and fast polarization |
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