High Collimation and Low Collimation Winds in HH 34?
We present preliminary results of VLA D-configuration observations of the high-density gas toward the HH 34 system exciting source (HH 34 IRS). We observed the (J,K) = (1,1) transition of the ammonia molecule. The brightest high-density condensation is a shell-like structure that surrounds the east side of the star HH 34 IRS, and coincides with the reflection nebula associated with HH 34 IRS5. If this condensation is part of a spherical shell dynamically related to HH 34 IRS, it should have been created at some stage by its stellar wind. This would imply that two kinds of stellar wind might have been present: an isotropic wind that has created the shell, and a highly collimated wind that is at the origin of the jet.