Abstract
We present sensitive Very Large Array observations at 3.5 cm toward ten regions with Herbig-Haro flows. We detect for the first time at cm wavelengths the exciting sources of the HH 211 and HH 68 outflows. We also present 7-mm observations of the exciting source of HH 211. Our analysis of the cm and mm spectrum indicate that in this source the 3.5 cm emission is dominated by free-free emission from a thermal jet, while the 7-mm emission is dominated by dust emission most probably arising from a disk. This disk is small, with radius smaller than 10 AU, placing it in the category of compact protoplanetary disks. The exciting source of HH 68 coincides with the object HH 68b, as previously suggested by other authors. We also find that the exciting source of the HH 119 flow in B335, previously reported at centimeter wavelengths, is time-variable.
