Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...240..553e&link_type=abstract
Astrophysical Journal, Part 1, vol. 240, Sept. 1, 1980, p. 553-566.
Astronomy and Astrophysics
Astrophysics
84
Astronomical Models, Interstellar Masers, Late Stars, Silicon Oxides, Stellar Atmospheres, Stellar Radiation, Collision Rates, Optical Pumping, Photons, Polarization (Waves), Stellar Envelopes, Stellar Mass Ejection
Scientific paper
It is shown that currently available theoretical models for SiO masers cannot explain all the recent observations, especially the maser emission from v = 2 and v = 3 states and the fact that the masers are observed in stars which cover a wide range of parameters, in particular mass loss rates. A new model for the SiO masers in late-type stars is therefore developed which differs from the commonly accepted picture in its two basic ingredients. Unlike previous models, the proposed pump mechanism is based upon collisions rather than radiation and utilizes properties of the collision cross sections discussed elsewhere. Rather than locating the masers in the expanding circumstellar shell, it is suggested that the emission of strong maser spikes has its origin in material in the upper atmosphere of the star. This material takes part in large mass motions which have been the subject of numerous recent observational and theoretical studies, unrelated to SiO masers.
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