Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-04-05
Astronomy and Astrophysics
Astrophysics
accepted for publication in A&A
Scientific paper
10.1051/0004-6361:20077554
The study of the innermost circumstellar layers around AGB stars is crucial to understand how these envelopes are formed and evolve. The SiO maser emission occurs at a few stellar radii from the central star, providing direct information on the stellar pulsation and on the chemical and physical properties of these regions. Our data also shed light on several aspects of the SiO maser pumping theory that are not well understood yet. We aim to determine} the relative spatial distribution of the 43 GHz and 86 GHz SiO maser lines in the oxygen-rich evolved star R Leo. We have imaged with milliarcsecond resolution, by means of Very Long Baseline Interferometry, the 43 GHz (28SiO v=1, 2 J=1-0 and 29SiO v=0 J=1-0) and 86 GHz (28SiO v=1 J=2-1 and 29SiO v=0 J=2-1) masing regions. We confirm previous results obtained in other oxygen-rich envelopes. In particular, when comparing the 43 GHz emitting regions, the 28SiO v=2 transition is produced in an inner layer, closer to the central star. On the other hand, the 86 GHz line arises in a clearly farther shell. We have also mapped for the first time the 29SiO v=0 J=1-0 emission in R Leo. The already reported discrepancy between the observed distributions of the different maser lines and the theoretical predictions is also found in R Leo.
Alcolea Javier
Bujarrabal Valentin
Colomer Francisco
Desmurs J.-F.
Soria-Ruiz Rebeca
No associations
LandOfFree
Mapping the circumstellar SiO maser emission in R Leo does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Mapping the circumstellar SiO maser emission in R Leo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mapping the circumstellar SiO maser emission in R Leo will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-292977