Astronomy and Astrophysics, volume 336, 329-338 (1998/8-1)
The Cometary Globules CG30/31/38 in the Gum nebula. A radio line spectroscopic investigation.
NIELSEN A.S., OLBERG M., KNUDE J. and BOOTH R.S.
Abstract (from CDS):
We present radio line observations from the SEST. On the basis of 13CO(J=1-0) measurements we estimate the H2 mass associated with the globules CG30/31A-C/38 to be ∼43M☉. The gas kinetic temperature of the globules is in the range 5 to 14K. Line wings seen in the 12CO spectra as well as higher dipole moment molecules towards CG30, 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 ∼0.3M☉ and the dynamical time scale is 1.7x104 years. The mechanical luminosity is 0.11L☉ for an assumed inclination of 90°. The 13CO(J=1-0) data have revealed that CG30 is a possible double globule, the small companion (here named CG30B) having a mass of ∼25% of the larger globule, corresponding to ∼2M☉.
stars: low-mass, brown dwarfs - stars: formation - ISM: individual objects: CG30 - ISM: individual objects: CG31 - ISM individual objects: CG38 - ISM: kinematics and dynamics