SPHERE/ZIMPOL observations of the symbiotic system R Aquarii - I. Imaging of the stellar binary and the innermost jet clouds

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Volume 602 (June 2017)

A&A, 602 (2017) A53

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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	λ_c	Files/cam	τ₀	Strehl S₀	ct(r)/ct_3dia [%]							ct_1M/ ct_3dia
	[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	1.9^a		0.091	5.0	10.5	18.8	42.7	86.9	114
CntHa	645	0051-54/1	2.9	4.2^a		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	8.3^a		0.244	12.5	23.4	35.1	50.2	89.9	102
Cnt748	747	0043-46/2	2.8	10.3^a		0.280	14.1	25.7	38.3	52.6	91.0	106
Cnt820	817	0047-50/1+2	2.7	23.9^a		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)/ct_3dia relative to the counts ct_3dia 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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