Young, active radio stars in the AB Doradus moving group

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Table 5

Estimates of the astrometric and orbital parameters of HD 160934.

Parameter	Value

α₀ (h m s):	17 38 39.6349 ± 0.0002
δ₀ (°′′′):	+61 14 16.0238 ± 0.0015
μ_α (s yr^-1):	−0.0025 ± 0.0002
μ_δ (arcsec yr^-1):	0.0469 ± 0.0002
π (arcsec)^a:	0.0314 ± 0.0005

P (yr):	10.26 ± 0.08
a_rel (′′):	0.1554 ± 0.0008
a_A (′′):	0.0603 ± 0.0014
a_c (′′):	0.0952 ± 0.0014
e:	0.64 ± 0.03
i (°):	82.72 ± 0.12
ω_c (°)^b:	37.7 ± 0.5
Ω (°):	266.74 ± 0.12
T₀:	2002.4 ± 0.1

m_A (M_⊙):	0.70 ± 0.07
m_c (M_⊙):	0.45 ± 0.04

Notes. The reference epoch is 2000.0. The number of degrees of freedom of the fit is 14; the minimum value found for the reduced χ² is 1.2.

^(a)

Our parallax estimate is more accurate than the Hipparcos value given for AB Dor A but fully compatible with that within the uncertainty.

^(b)

For the absolute orbit of HD 160934 A, ω_A = ω_c + π.

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