Table 1
Log of the SPHERE/ZIMPOL observations of Betelgeuse and φ2 Ori (PSF calibrator).
| No | Star | MJD | Cam. | Filter | ND | Trans. | DIT [s] | Dither | ΣDIT | θ | AM | S | θPSF | PA |
| −57 110 | [%] | × NDIT | × Exp.[s] | [s] | [′′] | [%] | [mas] | [deg] | ||||||
|
|
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| 1 | α Ori | 1.9965 | cam1 | TiO717 | ND2 | 0.89 | 3.5 × 10 | 3 × 2 | 840 | 0.93 | 1.34 | − | ||
| α Ori | 1.9965 | cam2 | V | ND2 | 0.62 | 3.5 × 10 | 3 × 2 | 264 | 0.93 | 1.34 | − | |||
|
|
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| 2 | α Ori | 2.0096 | cam1 | CntHα | ND1 | 8.20 | 1.1 × 30 | 3 × 2 | 792 | 0.88 | 1.41 | − | ||
| α Ori | 2.0096 | cam2 | NHα | ND1 | 8.20 | 1.1 × 30 | 3 × 2 | 792 | 0.88 | 1.41 | − | |||
|
|
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| 3 | φ2 Ori | 2.0260 | cam1 | TiO717 | ND1 | 8.20 | 3.5 × 6 | 3 × 2 | 504 | 0.91 | 1.68 | 44 | 25 × 22 | 177 |
| φ2 Ori | 2.0260 | cam2 | V | ND1 | 8.20 | 3.5 × 6 | 3 × 2 | 504 | 0.91 | 1.68 | 26 | 25 × 18 | 179 | |
|
|
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| 4 | φ2 Ori | 2.0362 | cam1 | CntHα | None | 100 | 3.5 × 6 | 3 × 2 | 504 | 0.85 | 1.80 | 36 | 25 × 22 | 178 |
| φ2 Ori | 2.0362 | cam2 | NHα | None | 100 | 3.5 × 6 | 3 × 2 | 504 | 0.85 | 1.80 | 40 | 22 × 20 | 169 | |
Notes. MJD is the average modified Julian date. ND indicates if a neutral density filter has been used; its transmission is listed in the Trans. column. DIT is the exposure time of the individual frames, and NDIT is the number of frames per exposure. Dither is the number of dithering positions (± 14 pix), and Exp. the number of exposures per position. θ is the visible seeing, and AM the airmass. S is the Strehl ratio of the PSF images. θPSF is the FWHM of the PSF images (Gaussian fit), and PA is the position angle of the major axis of the PSF elliptical core (north = 0°).
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