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Table 14.

Normalized mean counts ctn6 for the PSF surface brightness of R Aqr and the polarized surface brightness of the circumstellar region along the position angle ϕ = 9° for the frames for the intensity Inb, Isat, and Icoro and the polarized flux Qnb, Qsat, and Qcoro.

Parameter ρ[″]= 0 0.018 0.108 0.288 0.432 0.864 1.728
r [pix] = 0 5 30 80 120 240 480
area [pix] 1 × 1 1 × 5 10 × 10 10 × 10 10 × 10 10 × 10 20 × 20
Intensity
Inb(r) ctn6 5775 1846 14.9 2.9 : :
Isat(r) ctn6 5116a 1823 18.7 4.7 3.2 0.67 : :
Icoro(r) ctn6 15.4b 1.60b 7.13 3.39 3.82 0.61 0.073
Polarized flux
Qnb(r) ctn6 26.2 12.1 0.24 0.013::
Qsat(r) ctn6 32.3a 21.1 0.368 0.028 0.086 5.4 × 10−3
Qcoro(r) ctn6 0.025b 0.0292b 0.319 0.0216 0.126 7.4 × 10 3 0.14 × 10 3
Fractional polarization
Q(r)/I(r) 0.45% 1.16% 1.98% 0.64% 3.3% 1.2% 0.19%
Surface brightness contrast [Δmag arcsec−2]
CSB(r) c mag −6.6 −5.4 0.6 1.5 1.3 3.3 5.6
CSBpol(r) (R Aqr) mag −0.8 −0.5 4.0 6.9 5.0 8.1 12.4
Artifical point source contrast [Δmag]
Cpol d (b,c,d,e) mag 10.8 12.5 12.5 12.5
Cpol(r) 5σ-limit mag 8.8 12.6 13.0 14.9 15.6

Notes.

(a)

Saturated PSF peak;

(b)

coronagraphically attenuated PSF peak;

(c)

surface brightness contrast CSB = SBmstar;

(d)

polarized flux point source contrast Cpol = mpolmstar.

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