Table 1
Summary of SPHERE-ZIMPOL observations for IK Tau and its PSF reference star HIP 20188.
| # | tobs | DIT | NDIT | Nexp | Npol | Ndither | Filter | Seeing | AM | Strehl | Strehl |
|---|---|---|---|---|---|---|---|---|---|---|---|
| (UTC) | (s) | (cam1/cam2) | (′′) | (H) | (visible) | ||||||
| IK Tau: 2016 Nov 20 (UTC) | |||||||||||
| 1 | 02:40:58 | 80.0 | 2 | 1 | 2 | 3 | CntHa/NHa | 0.62 | 1.38 | 0.74 | 0.14 |
| 2 | 03:21:54 | 10.0 | 2 | 1 | 7 | 3 | TiO717/Cnt748 | 0.91 | 1.25 | 0.71 | 0.18 |
| 3 | 06:57:36 | 5.0 | 4 | 1 | 3 | 3 | Cnt820/Cnt820 | 0.68 | 1.6 | 0.73 | 0.28 |
| HIP 20188: 2016 Nov 20 (UTC) | |||||||||||
| C1 | 05:21:49 | 4.0 | 40 | 1 | 1 | 3 | CntHa/NHa | 0.75 | 1.23 | 0.77 | 0.22 |
| C2 | 05:59:43 | 2.0 | 6 | 1 | 7 | 3 | TiO717/Cnt748 | 1.16 | 1.28 | 0.79 | 0.28 |
| C3 | 06:30:04 | 2.0 | 8 | 1 | 3 | 3 | Cnt820/Cnt820 | 0.76 | 1.34 | 0.82 | 0.41 |
Notes. DIT: detector integration time. NDIT:number of frames. Nexp: number of exposures of each polarization component in each polarization cycle at each dithering position. Npol: number of polarization cycles at each dithering position. Ndither: number of dithering positions. The seeing was measured in the visible. AM: airmass. The Strehl ratios in the visible were calculated from the H-band Strehl ratiosfor IK Tau, while they were measured from the observed ZIMPOL images for HIP 20188.
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