Table 1
Log of the VISIR observations of Betelgeuse and Aldebaran.
| Star | MJD∗ | Filter | NDIT | DIT | θ | AM |
| (ms) | (″) | |||||
|
|
||||||
| α Tau | 12.2877 | J7.9 | 1600 | 40 | 0.70 | 1.38 |
| α Tau | 12.2897 | PAH1 | 6400 | 10 | 0.69 | 1.39 |
| α Tau | 12.2917 | SIV | 4000 | 16 | 0.75 | 1.40 |
| α Tau | 12.2936 | PAH2 | 8000 | 8 | 0.63 | 1.40 |
| α Tau | 12.2957 | SiC | 5120 | 12.5 | 0.78 | 1.41 |
| α Tau | 12.2977 | NeII | 5120 | 12.5 | 1.02 | 1.42 |
| α Tau | 12.3005 | Q 1 | 10 240 | 12.5 | 1.08 | 1.43 |
| α Tau | 12.3039 | Q 3 | 16 000 | 8 | 1.27 | 1.44 |
|
|
||||||
| α Ori | 12.3136 | J7.9 | 1800 | 40 | 1.89 | 1.18 |
| α Ori | 12.3166 | PAH1 | 14 400 | 10 | 1.51 | 1.19 |
| α Ori | 12.3203 | SIV | 9000 | 16 | 1.59 | 1.19 |
| α Ori | 12.3239 | PAH2 | 16 000 | 8 | 1.40 | 1.19 |
| α Ori | 12.3274 | SiC | 11 520 | 12.5 | 1.66 | 1.20 |
| α Ori | 12.3309 | NEII | 11 520 | 12.5 | 1.91 | 1.20 |
| α Ori | 12.3337 | Q 1 | 6080 | 12.5 | 1.75 | 1.21 |
| α Ori | 12.3357 | Q 3 | 8000 | 8 | 1.70 | 1.21 |
Notes. MJD∗ is the modified Julian date of the start the exposures on the target minus 55 500. The Detector Integration Time (DIT) is the exposure time for one BURST image, θ the seeing in the visible (λ = 0.5 μm) measured by the observatory DIMM sensor, and AM the airmass of the observation.
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