Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-06-02
Astronomy and Astrophysics
Astrophysics
APEX A&A special issue, accepted
Scientific paper
10.1051/0004-6361:20065458
Vibrationally excited emission from the SiO and H2O molecules probes the innermost circumstellar envelopes of oxygen-rich red giant and supergiant stars. VY CMa is the most prolific known stellar emission source in these molecules. Observations were made to search for rotational lines in the lowest vibrationally excited state of H2O. The APEX telescope was used for observations of H2O lines at frequencies around 300 GHz. Two vibrationally excited H2O lines were detected, a third one could not be found. In one of the lines we find evidence for weak maser action, similar to known (sub)millimeter H2O lines. We find that the other line's intensity is consistent with thermal excitation by the circumstellar infrared radiation field. Several SiO lines were detected together with the H2O lines.
Alcolea Javier
Bruenken Sandra
Guesten Rolf
Menten Karl. M.
Philipp Sabine D.
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