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Table C.1

Best models for i = 20° and inferred source properties.

Scenario 1 2 3
Plotting color Orange Red Green
Wiggling cause Orbital Orbital Precession
CO jet source VLA4B Companion VLA4B
[FeII] jet source VLA4B VLA4B VLA4B

Wiggling model parameters (bold face are imposed)

Orbit/precession sense Counterclockwise
Mean jet PA (±2°) 152° 155° 154°
Projected half-angle 10° 10° 10°

Orbital period τo (yr) 92 94
Orbital velocity Vo (km s-1) 5.8 5.8 1.2
Orbital radius ro (au) 18 18
PA to companion (±3°) 249 69

Precession period τp (yr) 116
Deprojected half-angle δ 3.5°

Inferred binary parametersa,b (bold face are imposed)

a (au) 20–32 20–26c ≤ 0.5
Mtot (M) 14 1–2 0.1–2
MCOjet (M) 0.11.8 0.10.6 0.1–2
M2 (M) 0.92.2 0.91.4 0.010.03



inferred from and μ = M2/Mtot = ro/a;


in Scenario 3, assume rigid disk precession obeying Eq. (1) of Terquem et al. (1999) with disk radius R/a 1/3 and Vo = 2πro/τo ≤ 1.2 km s-1 (jet orbital spreading < 2°). However, non-rigid disk precession induced by VLA4A is not excluded.


upper value suggested by our model fit.

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