Table 2
PSF and correction curve f (r) characteristics for a few representative cases for SPHERE.
| Date | Atmosphere |
Instrument mode |
f(r) charateristics |
|||||
|---|---|---|---|---|---|---|---|---|
| Category | seeing(″) | τ0 | airmass | nDIT × tDIT | Filter | r = 0.15″ | 0.30″ | 0.60″ |
| “excellent” | ||||||||
| Jun. 30, 2016 | 0.41 | 5.5 | 1.03 | 4 × 0.8375 s | J | 1.53 | 1.33 | 1.23 |
| “good” | ||||||||
| Jun. 22, 2016 | 0.73 | 5.1 | 1.16 | 4 × 0.8375 s | J | 1.66 | 1.39 | 1.27 |
| Apr. 01, 2015 | 0.74 | 3.0 | 1.10 | 4 × 10s | I′ | 1.70 | 1.46 | 1.30 |
| 0.74 | 3.0 | 1.10 | 4 × 10s | R′ | 1.92 | 1.60 | 1.34 | |
| “bad” | ||||||||
| May 12, 2016 | 1.96 | 1.1 | 1.13 | 10×2s | J | 2.15 | 1.74 | 1.52 |
Notes. The data were selected from the PSF calibrations obtained for HD 135344B (see Table A.1). The contribution of the disk intensity to the stellar PSF is estimated to be about 2% for the R′ and I′ bands, and about 4% for the J band assuming 
.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.