A search for CaO at mm-wavelengths in stars and molecular clouds.
Abstract
Results are reported for an unsuccessful search for the J 4-3 rotational transitions of CaO in the ground and first excited vibrational states toward a selected group of 32 objects. The rest frequencies of these transitions are approximately 106, 192 MHz (J 4-3, v 0) and 105,398 MHz (J 4-3, v 1). Conservative upper limits are placed on the CaO column densities in the sources observed. It is concluded that CaO is not strongly mased in the J 4-3 transition in either the v 0 or the v 1 state.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- June 1979
- Bibcode:
- 1979A&A....75..268H
- Keywords:
-
- Calcium Oxides;
- Electron Transitions;
- Interstellar Matter;
- Millimeter Waves;
- Molecular Rotation;
- Stellar Atmospheres;
- Interstellar Extinction;
- Molecular Oscillations;
- Molecular Spectra;
- Stellar Envelopes;
- Astrophysics;
- Calcium:Molecular Clouds;
- Calcium:Stellar Envelopes