Table 1
Summary of the SPHERE-ZIMPOL observations of W Hya.
| # | tobs | DIT | NDIT | Nexp | Ndither | Filter | Seeing | AM | Strehl | Strehl |
| (UTC) | (sec) | (ND/cam1/cam2) | (′′) | (H) | (visible) | |||||
|
|
||||||||||
| W Hya: 2015 July 08 (UTC) | ||||||||||
|
|
||||||||||
| 1 | 00:23:22 | 10 | 10 | 1 | 3 | –/CntHa/NHa | 0.94 | 1.04 | 0.86 | 0.37 |
| 2 | 01:09:06 | 1.2 | 10 | 8 | 3 | –/TiO717/Cnt748 | 1.08 | 1.11 | 0.88 | 0.51 |
| 3 | 01:47:22 | 2 | 6 | 6 | 3 | ND1/Cnt820/Cnt820 | 1.03 | 1.20 | 0.79 | 0.39 |
|
|
||||||||||
| HD 121653: 2015 July 08 (UTC) | ||||||||||
|
|
||||||||||
| C1 | 02:28:20 | 20 | 4 | 1 | 3 | –/CntHa/NHa | 1.27 | 1.31 | 0.56 | 0.030 |
| C2 | 02:54:50 | 10 | 2 | 4 | 3 | –/TiO717/Cnt748 | 1.20 | 1.45 | 0.59 | 0.071 |
| C3 | 03:16:42 | 10 | 2 | 4 | 3 | –/Cnt820/Cnt820 | 1.26 | 1.59 | 0.57 | 0.082 |
Notes. DIT: detector integration time. NDIT: number of frames. Nexp: number of exposures of each polarization component at each dithering position. Ndither: number of dithering positions. AM: airmass. The Strehl ratios in the visible are computed from the H-band Strehl ratios for W Hya, while they were measured from the observed ZIMPOL images for HD 121653.
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