Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...399..704l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 399, no. 2, p. 704-713.
Astronomy and Astrophysics
Astrophysics
62
Astronomical Models, Emission Spectra, Interstellar Masers, Late Stars, Silicon Oxides, Brightness Temperature, Vibrational Spectra
Scientific paper
Both radiative and collisional pumping of the SiO masers around late-type stars is investigated, with particular attention given to the combined and separate actions of each type of pump in order to gauge its effectiveness. Collisional pumping is found to be severely underestimated when the model calculations use a small number of rotational levels in each vibrational state. A procedure that corrects this problem and gives results that are nearly independent of the number of levels used in the calculations is developed. The model is based on observations and theoretical arguments that place the SiO masers in high-density clumps rather than in the smooth stellar wind. Collisional pumping is found to produce the strongest maser emission; in contrast to radiative pumping, it generates maser radiation over the entire observed region and does not require fine tuning of the physical parameters for its operation. Collisional pumping is argued to be the primary pumping mechanism responsible for the SiO maser phenomenon.
Elitzur Moshe
Lockett Philip
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