Table 2
Observation details on the new and archival data.
| Target | Filter | UT date | DIT (a) | Nimages | Δπ (b) | Airmass | Seeing (c) | τ0 (d) | FWHM(e) |
|---|---|---|---|---|---|---|---|---|---|
| (s) | (deg) | (arcsec) | (ms) | (mas) | |||||
| New data | |||||||||
| HIP 65426 | NB4.05 | 2018 Jun. 7 | 1.0 | 11 520 | 99.5 | 1.12–1.22 | 1.52(3.01) | 3.5(0.6) | 112.8 ± 0.9 |
| PZ Tel | NB4.05 | 2018 Jun. 8 | 1.0 | 1160 | 35.3 | 1.11–1.19 | 0.82(0.06) | 4.2(0.5) | 112.5 ± 1.1 |
| PZ Tel | M′ | 2018 Jun. 8 | 0.04 | 40 000 | 25.1 | 1.13–1.21 | 0.85(0.07) | 4.9(1.0) | 125.9 ± 2.2 |
| HD 206893 | NB4.05 | 2018 Oct. 24 | 0.9 | 3752 | 68.5 | 1.02–1.04 | 1.02(0.10) | 3.1(0.6) | 111.6 ± 0.9 |
| HD 206893 | M′ | 2018 Jun. 8 | 0.04 | 115 000 | 85.5 | 1.02–1.08 | 0.89(0.09) | 4.5(0.6) | 121.7 ± 1.1 |
| Archival data | |||||||||
| β Pic | NB3.74 (f) | 2012 Dec. 18 | 0.1 | 12 000 | 43.1 | 1.12–1.18 | 0.88(0.05) | 4.3(0.6) | 108.2 ± 1.1 |
| β Pic | NB4.05 | 2012 Dec. 16 | 0.075 | 25 600 | 57 | 1.12–1.15 | 0.74(0.02) | 5.5(1.0) | 113.4 ± 1.1 |
| HIP 65426 | L′ | 2017 May 18 | 0.2 | 30 224 | 86.9 | 1.12–1.33 | 0.90(0.11) | 3.8(0.5) | 107.3 ± 1.0 |
| HIP 65426 | M′ | 2017 May 20 | 0.05 | 72 900 | 73.3 | 1.12–1.35 | 0.64(0.04) | 5.2(1.2) | 135.4 ± 0.9 |
| PZ Tel | L′ | 2010 Sep. 26 | 0.3 | 14 400 | 42.4 | 1.11–1.21 | 3.60(2.54) | 0.9(0.1) | 99.2 ± 1.7 |
| HD 206893 | L′ | 2016 Aug. 9 | 0.3 | 18 000 | 96.7 | 1.04–1.09 | 0.86(0.09) | 5.7(1.2) | 117.0 ± 1.8 |
Notes. The upper part of the table lists the observed targets and the lower part the archival datasets that were analyzed. (a) The total integration time is given by the product of detector integration time (DIT) and the total number of images (Nimages). (b) Total parallactic rotation. (c)Mean and standard deviation of the seeing as measured by the differential image motion monitor (DIMM) at 0.5 μm. (d) Mean and standard deviation of the coherence time. (e)Full width at half maximum of the unsaturated point spread function (see main text for details). (f) Archival data which has not yet been published.
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