The Cometary Globules CG 30 / 31 / 38 in the Gum nebula A radio line spectroscopic investigation ?

We present radio line observations from the SEST. On the basis of 13 CO (J=1–0) measurements we estimate the H 2 mass associated with the globules CG 30/31A-C/38 to be ∼43 M. The gas kinetic temperature of the globules is in the range 5 to 14 K. Line wings seen in the 12 CO spectra as well as higher dipole moment molecules towards CG 30, indicate that a dense molecular outflow is present. Especially the red wing reveals itself very clearly and is collimated, whereas the blue wing is weak and the emission is smeared out. The mass of the outflow is ∼0.3 M and the dynamical time scale is 1.7×10 4 years. The mechanical luminosity is 0.11 L for an assumed inclination of 90 •. The 13 CO (J=1–0) data have revealed that CG 30 is a possible double globule, the small companion (here named CG 30B) having a mass of ∼25% of the larger globule, corresponding to ∼2 M .