An analytical model of the SiO maser velocity spectrum

Details An analytical model of the SiO maser velocity spectrum An analytical model of the SiO maser velocity spectrum

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984acaps...4...97s&link_type=abstract

(Acta Astrophysica Sinica, vol. 4, no. 2-3, 1984, p. 97-106) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 8, Dec. 1

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Astronomical Models, Emission Spectra, Interstellar Masers, Silicon Oxides, Stellar Envelopes, Variable Stars, Computational Astrophysics, Mira Variables, Spectral Line Width, Stellar Oscillations, Velocity Distribution

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SiO maser sources associated with Mira variables show a wide velocity spread in the spectral line and a variety of profiles, and this velocity spread may be ultimately traced to the star's pulsation. The propagation of a perturbation generated by the pulsation in the circumstellar envelope (regarded as a compressible fluid) is considered. Using observed average parameter values for the Mira stars, the model gives, at the distance of the SiO maser, a velocity spread of + or - 6 km/s, in good agreement with the observed widths. The question of a correlated variation of the line width with the optical phase is also discussed.

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