Radio and Optical Observations of DG Tau B
  DG Tau B is a Class I young stellar source that drives the asymmetric HH 159
bipolar jet. At optical wavelengths it is obscured by circumstellar
optically-thick material. Using VLA and JVLA observations, we determine for the
first time the proper motions of this source and find them to be consistent,
within error, with those of the nearby young star DG Tau. We also discuss an
ejection event that is evident in the 1994 VLA data. As the optical and
molecular outflows, this ejection traced in the radio continuum is markedly
asymmetric and was detected only to the NW of the star. We propose that this
knot, no longer detectable in the radio, could be observed in future optical
images of DG Tau B. The positions of the VLA source and of a nearby infrared
object are not coincident and we suggest that the VLA source traces the
exciting object, while the infrared source could be a reflection lobe.
