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Table 2

PSF parameters for the red giant in R Aqr and the standard star HD 183143 in different filters.

Filter λc Files/cam τ0 Strehl S0 ct(r)/ct3dia [%] ct1M/ ct3dia
[nm] [ms] ratio r [pix] = 0 5 10 30 100 300 [%]
[%] npix = 1 81 317 2821 31 417 282 697

R Aqr, OBS284_xx
V 554 0055-58/1+2 3.3 1.9a 0.091 5.0 10.5 18.8 42.7 86.9 114
CntHa 645 0051-54/1 2.9 4.2a 0.151 8.6 18.2 28.7 45.3 86.1 118
max 0051/1 5.9 a 0.215 10.5 19.3 28.7 45.8 86.8
min 0053/1 3.2 a 0.114 7.0 16.0 26.7 43.2 85.2
TiO 717 0043-46/1 2.8 8.3a 0.244 12.5 23.4 35.1 50.2 89.9 102
Cnt748 747 0043-46/2 2.8 10.3a 0.280 14.1 25.7 38.3 52.6 91.0 106
Cnt820 817 0047-50/1+2 2.7 23.9a 0.541 25.4 41.0 54.9 65.3 93.9 103
HD 183143, STD261_xx
V 554 0017-20/1+2 8.8 8.8 0.431 18.9 31.9 43.6 65.9 93.6 106
N_R 646 0013-16/1+2 8.1 13.5 0.489 21.1 35.9 48.9 66.9 94.4 105
N_I 790 0021-24/1+2 8.1 20.9 0.505 24.4 39.9 54.9 69.2 94.7 105

Notes. PSF parameters are coherence time τ0, approximate Strehl ratios S0, and encircled counts for different wavelength bands. Encircled counts ct(r) are given for round synthetic apertures with radius r and total number of pixels npix and expressed as ratio ct(r)/ct3dia relative to the counts ct3dia in an aperture with a diameter of 3′′ or r = 416 pix (npix = 543 657). The ratio in the last column compares the counts on the full 1k × 1k area of the detector with the counts in the round 3′′-aperture.

(a)

R Aqr is a source with strong (intrinsic circumstellar) scattering and therefore this is not a Strehl ratio of a point source.

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