Theoretical modelling of SiO maser lineshapes

Details Theoretical modelling of SiO maser lineshapes Theoretical modelling of SiO maser lineshapes

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ap%26ss.224...63g&link_type=abstract

Astrophysics and Space Science, Volume 224, Issue 1-2, pp. 63-68

Astronomy and Astrophysics

Astrophysics

7

Scientific paper

Various factors affecting the lineshapes of SiO masers have been considered: saturation, competitive gain, velocity redistribution and properties of the circumstellar envelope supporting the masers. The lineshape of a single maser spot is likely to be dominated by conditions of complete velocity redistribution (CVR) for low to moderate amplification, changing to NVR (no velocity redistribution) only for strongly saturating masers. Both CVR and NVR regimes can produce peculiar lineshapes. When many maser ‘cells’ were considered, distributed at random in the stellar envelope, the individual lineshapes were combined to produce synthetic spectra. Maser action is predicted in higher rotational transitions than those observed to date, for example the J=7-6 transition of v=2.

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