Fig. 1.

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Orion binaries studied in DYNAMO-VLBA for which orbital motion or significant astrometric acceleration could be derived. Central panel: Wide-field infrared view of the Orion star-forming region using WISE imaging. RGB image is composed from W3 (12 μm, red), W2 (4.6 μm, green), and W1 (3.4 μm, blue) bands. Cyan regions indicate areas affected by saturation in the WISE images. Blue symbols mark the positions of 13 binaries observed in our sample, where orbital or acceleration parameters could be derived. Marker shapes are unique to each system for clarity. Zoomed views of the ONC and NGC 2024 regions are also shown. The yellow star marks the position of θ1 Ori C for reference. The surrounding subplots display the projected stellar orbital motions, plotted as apparent motion on the sky. In panels showing two ellipses, the black and red curves correspond to the best-fit astrometric models for the primary and secondary components, respectively. In panels with a single ellipse, the curve represents the orbital motion of the detected radio source. In the cases of V* V1230 Ori B and COUP 450, the arrows represent the measured acceleration vectors and errors. For V* V1230 Ori B, the black cross indicates the relative position of the associated Gaia source, likely corresponding to the primary component of the system.
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