Theoretical modelling of SiO maser lineshapes

M. D. Gray, E. M L Humphreys, D. Field

    Research output: Contribution to journalArticlepeer-review

    Abstract

    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. © 1995 Kluwer Academic Publishers.
    Original languageEnglish
    Pages (from-to)63-68
    Number of pages5
    JournalAstrophysics and Space Science
    Volume224
    Issue number1-2
    DOIs
    Publication statusPublished - Feb 1995

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