The relative intensity and velocity of SiO J = 1->0, ν = 1 and 2 masers.
Abstract
The SiO J = 1-0, v = 1 and 2 maser transitions were observed nearly simultaneously with accurate cross calibration in a sample of sources. The integrated and peak intensity of the two masers are comparable and many precise velocity agreements are seen in individual features. Broad emission plateaus (Snyder et al. 1978) are seen in both the v = 1 and 2 transitions. These results strongly suggest that the two masers share a common pump source and are spatially coincident in a spherical mass loss flow. A strong, variable feature at radial velocity of +5 km/s was observed in Orion which may indicate the presence of a second distinct source.
- Publication:
-
The Astronomical Journal
- Pub Date:
- September 1979
- DOI:
- 10.1086/112549
- Bibcode:
- 1979AJ.....84.1349S
- Keywords:
-
- Electron Transitions;
- Interstellar Masers;
- Late Stars;
- Radial Velocity;
- Radiant Flux Density;
- Silicon Oxides;
- Astronomical Spectroscopy;
- Omicron Ceti Star;
- Stellar Spectra;
- Vibrational Spectra;
- Astrophysics;
- Circumstellar Shells:SiO Masers;
- Late-Type Stars:SiO Masers;
- SiO Masers:Velocities