Focal plane masks in the SPHERE visual coronagraph.
|4QPM1||+||λ0 = 666 nm|
|4QPM2||+||λ0 = 823 nm|
|Bar||w = 155 mas|
Notes. The first column gives the mask name where NC stands for no coronagraph, CLC for classical Lyot coronagraph, 4QPM for four quadrant phase mask, WF for wide field (radius ρ = 4″), NF for narrow field (1″×1″). Masks on plates p are indicated in the second column and ρ is the mask radius in μm and converted to mas using the scale 0.86 mas μm−1. The last two columns give the maximum normalized counts for the α Hyi tests (Fig. 16) for the R_PRIM and I_PRIM filters, respectively.
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