Table 1
Observation log for HD 140283 using the VEGA interferometer on the CHARA array in three-telescope mode (telescopes E1, W1, and W2).
| Date | Sequence | r0 | Bands processed/ | No. of potential | Useful V2 | |
| dd-mm-yr | (cm) | width (nm) | V2 points | |||
|
|
||||||
| 2012-April-18 | C1-T-C1 | 5–8 | 3/10 | 9 | 1 | |
| 2012-May-21 | C2-T-C1 | 7–10 | 4/10 | 12 | 12 | |
| 2014-May-03 | C2-T-C2-T-C2 | 8–10 | 1/20 | 6 | 4 | |
| 2014-May-04 | C2-T-C3-T-C1 | 7–10 | 1/20 | 6 | 2 | |
Notes. See Sect. 2. The sequence contains information on the calibrator stars used and the number of calibrated points obtained where T = target and CN = Calibrator number N. The column r0 contains the average Fried parameter which describes the seeing conditions. Bands processed/width refers to the number of bands that were processed in the ~45 nm wavelength region and the width of each band (no overlap). The number of potential V2 points depends on the number of bands processed and the number of calibrated points × 3. The Useful V2 are those listed in Table 2. C1 = HD 141378 with θUD,R = 0.28 ± 0.02 mas where θUD,R means the uniform disk diameter in R band, C2 = HD 143459 with θUD,R = 0.265 ± 0.018 mas, and C3 = HD 138413 with θUD,R = 0.301 ± 0.022 mas.
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