GG Tauri: the fifth element | Astronomy & Astrophysics (A&A)

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Volume 565 (May 2014)

A&A, 565 (2014) L2

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Table 1

Relative astrometric position and flux contrast for the main binary Aa–Ab (photo-center of Ab1–Ab2), and for the close binary Ab1–Ab2, as derived from our best-fit of the closure phases measured by VLT/NaCo-SAM and VLTI/PIONIER.

	PIONIER		NACO-SAM		NACO-SAM		NACO-SAM		NACO-SAM
	H (2012-10-30)		H (2012-12-06/07)		K_s (2012-12-06)		H + K_s		L′ (2012-12-07)
	best-fit	σ	best-fit	σ	best-fit	σ	mean	σ	best-fit	σ

ρ [mas] Aa–Ab			256.1	1.5	255.8	3.5	256.1	1.3	256.3	3.3
PA [deg] Aa–Ab			329.6	0.3	329.3	0.8	329.5	0.4	328.9	0.8
F(Aa)/F(Ab)			2.36	0.04	1.99	0.04			1.88	0.23

ρ [mas] Ab1–Ab2	31.7	0.2	31.7	4.1	31.6	5.8	31.6	3.3	31.4	fixed
PA [deg] Ab1–Ab2	219.6	0.3	219.9	7.3	227.6	10.3	222.6	6.0	219.9	fixed
F(Ab1)/F(Ab2)	4.3^a	2.3^a	1.6		2.3	0.2			2.8	0.2

Notes. The formal errors on NaCo-SAM PA do not include uncertainties due the detector orientation.

^(a)

After correction for FOV attenuation (see text), the related uncertainty dominates.

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