A VLBI study of the wind-wind collision region in the massive multiple HD 167971

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Volume 624 (April 2019)

A&A, 624 (2019) A55

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Table 2.

HD 167971 astrometry.

VLBI coordinates of the emission’s peak
Epoch	RA	σ_RA	Dec	σ_Dec
2006.59	274.5245618°	0.4 mas	−12.2425887°	0.2 mas
2016.61	274.5245618°	1.9 mas	−12.2425957°	0.9 mas

SB relative position from the VLBI coordinates^(a)
Epoch	ΔRA	σ_ΔRA	ΔDec	σ_ΔDec

2006.59	−0.4 mas	0.4 mas	7.0 mas	0.3 mas
2016.61	−10.0 mas	2.0 mas	−3.8 mas	1.0 mas

Gaia coordinates^(b)
Epoch	RA	σ_RA	Dec	σ_Dec

2016.61	274.5245619°	0.2 mas	−12.2425958°	0.2 mas

Notes.

^(a)

The reported error bars include the uncertainty reported for the position of the binary system with respect to the radio emission derived from our model, and the intrinsic astrometric error of the radio maps.

^(b)

The reported error bars include the Gaia uncertainty of the 2015.5 position and the uncertainties in the proper motions.

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