Table 4.
SPHERE observation log.
| Star | UT 2018-08-17 | Filter | λ [nm] | Δλ | θ [″] | DIT [s] × NDIT | AM | θPSF [mas] | Strehl | Note |
|---|---|---|---|---|---|---|---|---|---|---|
| EP Aqr | 04:31:52 | CntHα | 644.9 | 4.1 | 0.60 | 5.0 × 12 | 1.085 | – | 0.67 | – |
| BHα | 655.6 | 5.5 | 0.60 | 5.0 × 12 | 1.085 | – | 0.68 | – | ||
| 05:17:31 | V | 554 | 80.6 | 0.62 | 5.0 × 12 | 1.092 | – | 0.55 | Sat. | |
| Cnt748 | 747.4 | 20.6 | 0.62 | 5.0 × 12 | 1.092 | – | 0.72 | Sat. | ||
| HD 1921 | 04:58:23 | CntHα | 644.9 | 4.1 | 0.71 | 5.0 × 8 | 1.208 | 27 | 0.24 | – |
| BHα | 655.6 | 5.5 | 0.71 | 5.0 × 8 | 1.208 | 27 | 0.25 | – | ||
| 05:55:26 | V | 554 | 80.6 | 0.54 | 5.0 × 8 | 1.073 | 26 | 0.20 | ND_1 | |
| Cnt748 | 747.4 | 20.6 | 0.54 | 5.0 × 8 | 1.073 | 27 | 0.41 | ND_1 |
Notes. UT stands for universal time, θ is the visible seeing, AM gives the air mass, and θPSF is the FWHM of the PSF images. DIT gives the integration time of each frame and NDIT is the number of integrations. ND_1 indicates the neutral density filter used. Sat. indicates CCD saturation. The Strehl ratios were obtained from the SPARTA (Standard Platform for Adaptive optics Real Time Applications) data and converted to the filter wavelength using the Marechal approximation.
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