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Table 10.
Measurements of the flux ratio fB/fA and the (S/N)B of α Hyi A and B, using different coronagraphic configurations of SPHERE/ZIMPOL.
| Instrument configuration | fB/fA | (S/N)B | Figs. | ||
|---|---|---|---|---|---|
| Coro / Angle, | Filter, nDIT × tDIT[s] | (10−3) | |||
| Test A: CLC-S-WF without / with pupil stop, pupil stabilized | |||||
| Without stop | NB730 | 10 × 8 | a | 5.2 | 19 |
| With stop | NB730 | 10 × 8 | a | 9.7 | 19 |
| Test B: different coronagraphic configurations | |||||
| off coro,ND2b | I-PRIM | 10×1.1 | 5.6 | 4.8 | 21 |
| CLC-S-WF | I-PRIM | 10 × 3 | 5.3 | 12.2 | 21 |
| CLC-MT-WF | I-PRIM | 10 × 3 | 4.0 | 11.6 | 21 |
| 4QPM2 | N_I | 20 × 3 | a | 10.3 | 21 |
| 4QPM2 | Cnt820 | 20 × 3 | a | 9.1 | |
| off coro,ND2b | R-PRIM | 10×1.1 | 2.7 | 3.5 | |
| CLC-S-WF | R-PRIM | 10 × 3 | 3.2 | 8.2 | |
| CLC-MT-WF | R-PRIM | 10 × 3 | 2.6 | 8.0 | |
| Test C: different rotation angles with CLC-S-WF | |||||
| 0° | I-PRIM | 20 × 3 | 5.3 | 12.2 | |
| 60° | I-PRIM | 20 × 3 | 3.7 | 5.2 | |
| 120° | I-PRIM | 20 × 3 | 5.3 | 10.0 | |
| mean | I-PRIM | 4.7±0.8 | 10.0 | ||
| median-subtr. | I-PRIM | 3.6c | 15.9 | ||
| 0° | R-PRIM | 20 × 3 | 2.7 | 5.8 | 22 |
| 60° | R-PRIM | 20 × 3 | 2.1 | 3.3 | 22 |
| 120° | R-PRIM | 20 × 3 | 3.1 | 4.6 | 22 |
| Mean | R-PRIM | 2.6±0.5 | 4.6 | 22 | |
| median-subtr. | R-PRIM | 1.6c | 10.5 | 22 | |
Notes. Commissioning data taken on 2014-10-10 between UT 7:40 and 8:50;
(b)
PSF parameters for this test are given in Table 7 and they are representative for all α Hyi data;
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