Abstract
Using high angular resolution ( ∼ 0to z @. hss ''3) Very Large Array (VLA) observations made at 3.6 cm during the period 1990 to 2002, we report the detection of proper motions in the components of the binary source YLW 15. We find absolute proper motions of the order of 15 km s-1. In addition, the relative astrometry between the two components reveals orbital proper motions that suggest that the total mass of this binary system is ∼ 1.7 M⊙, and that VLA 1 is more massive than VLA 2.
