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Table 1
Central wavelength, DIT × NDIT (number of DITs), seeing, and airmass for the Betelgeuse exposures as well as the full width at half maximum (FWHM) and SRs measured from the Phi2 Ori images.
| Filter | Central wavelength (nm) | DIT (s) × NDIT | Seeing (″) | Airmass | FWHM (mas) | Strehl ratio (%) |
|---|---|---|---|---|---|---|
| ZIMPOL (January 18, 2019) | ||||||
| V | 554 | 1.1 × 20 | 0.42−0.48 | 1.21−1.23 | 25.4 | 28.5 |
| Hα_CONT | 644.9 | 1.1 × 20 | 0.44−0.59 | 1.27−1.32 | 21.1 | 44.3 |
| Hα_NB | 656.5 | 1.1 × 20 | 0.44−0.59 | 1.27−1.32 | 21.2 | 46.3 |
| TiO_717 | 716.8 | 1.1 × 20 | 0.44−0.56 | 1.24−1.27 | 22.5 | 50.2 |
| KI | 770.2 | 1.1 × 20 | 0.45−0.66 | 1.32−1.37 | 23.7 | 48.4 |
| 748cont | 747.4 | 1.1 × 20 | 0.45−0.66 | 1.32−1.37 | 23.5 | 51.3 |
| 820cont | 817.3 | 1.1 × 20 | 0.44−0.56 | 1.24−1.27 | 24.2 | 58.6 |
| IRDIS (January 17, 2019) | ||||||
| N_HeI | 1085 | 0.84 × 30 | 0.53−0.78 | 1.19−1.10 | 41.7 | 73.8 |
| N_CntJ | 1213 | 0.84 × 30 | 0.55−0.70 | 1.18−1.19 | 42.1 | 78.4 |
| N_PaB | 1283 | 0.84 × 30 | 0.52−0.70 | 1.20−1.22 | 39.2 | 80.5 |
Notes. Filters parameters can be retrieved at www.eso.org/sci/facilities/paranal/instruments/sphere/inst/filters.html
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