Cometary globules in the GUM nebula. I. Infrared and optical properties of CG 22.
Abstract
The authors have undertaken a detailed study of the structure and physical properties of cometary globules in the Gum nebula. This paper reports the properties of CG 22, the largest cometary globule in the system, derived from the IR and optical data. The cometary globule clearly splits into 3 individual blobs. The dust temperature distribution in the cometary globule shows temperatures ranging from 25 to 35K. The observed temperature and its gradient seem to be consistent with the heating of the dust by Interstellar Radiation Field. From the infrared fluxes, the dust masses for the three blobs have been derived to be ≡7×10-2M_sun;, ≡9×10-2M_sun;, and ≡6×10-2M_sun;. Star formation in the head of the cometary globule seems to be evident.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- April 1988
- Bibcode:
- 1988A&A...195..269S
- Keywords:
-
- Comets;
- Gum Nebula;
- Infrared Astronomy;
- Interstellar Extinction;
- Interstellar Matter;
- Visual Photometry;
- Brightness;
- H Alpha Line;
- Infrared Astronomy Satellite;
- Star Formation;
- Structural Analysis;
- Astrophysics