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=1984cha%26a...8..265s&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 8, Issue 4, p. 265-269.

Astronomy and Astrophysics

Astrophysics

Scientific paper

SiO maser sources associated with Mira variables show a wide velocity spread in the spectral line and a variety of profiles. We think this velocity spread may be ultimately traced to the star's pulsation. We consider the propagation of a perturbation generated by the pulsation in the circumstellar envelope, regarded as a compressible fluid. Using observed average parameter values for the Mira stars, our model gives, at the distance of the SiO maser, a velocity spread of +/-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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