Fig. 4

Central 50′′ field comprising the MHO 2235 NE part. N up, E left. Left: epoch 4 image overlaid with knot identification and slit position for K-band spectroscopy. Right: Ep4 image with proper motion vectors, amplified by a factor 20 for clarity. The color coding of the pm vectors is as follows: PM14 (blue), PM12 (red), PM13 (green), PM24 (cyan), PM23 (yellow), PM34 (magenta). Protostars are shown with red circles. Ser-emb-11 E and W (a binary Class I) and Ser-emb-17 are strong candidate driving sources. Magenta circles denote YSO candidates from Harvey et al. (2006). The maser refers to an H2O maser position from Brand et al. (1994).
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