Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...430l..61d&link_type=abstract
The Astrophysical Journal, Part 2 - Letters, vol. 430, no. 1, p. L61-L64
Astronomy and Astrophysics
Astronomy
122
Late Stars, Maser Outputs, Maser Pumping, Radio Astronomy, Ring Structures, Very Long Baseline Array (Vlba), Collisional Plasmas, Maser Materials, Plasma Pumping, Silicon Oxides, Stellar Atmospheres
Scientific paper
We have used the National Radio Astronomy Observatory (NRAO) Very Long Baseline Array (VLBA) to make the first full high-resolution synthesis images of 43 GHz SiO masers around late-type stars. Our observations of the stars TX Cam and U Her reveal well-defined rings of maser emission at very approximately 2-4 stellar radii. These images are in contrast to earlier, less accurate, fringe-frequency maps of SiO masers which suggested chaotic structures in similar stars. We can place the SiO masers in the so-called extended atmosphere of the star, where the dynamics are very complex and dust grain formation occurs. Our observations demonstrate that the SiO maser outflow is ordered, not random, and that the masers are being tangentially amplified. We are unable to distinguish between proposed models for radiative and collisional pumping of the SiO masers.
Benson Ja.
Dhawan Vivek
Diamond Phil J.
Junor William
Kemball Athol J.
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