Monitoring observations of selected SiO maser sources at 7 MM wavelength - 1977-1979

Details Monitoring observations of selected SiO maser sources at 7 MM wavelength - 1977-1979 Monitoring observations of selected SiO maser sources at 7 MM wavelength - 1977-1979

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....92..416s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 92, Aug. 1986, p. 416-430. Research supported by Williams College and NASA.

Astronomy and Astrophysics

Astronomy

13

Interstellar Masers, Radio Sources (Astronomy), Silicon Oxides, Stellar Envelopes, Stellar Evolution, Stellar Spectrophotometry, Astronomical Spectroscopy, High Resolution, Molecular Clouds, Radial Velocity, Spectral Resolution

Scientific paper

High-spectral-resolution SiO maser observations at 7 mm wavelength were made for 13 circumstellar objects and Ori A over a 34 month interval from January 1977 to November 1979. These data precede and adjoin the SiO monitoring data taken at 3 and 7 mm wavelengths by Lane (1982) and at 3 mm wavelengths by Nyman and Olofsson (1985) and thus provide an important link in the record of the temporal behavior of SiO masers over a period of several years. The time-averaged center of the weak SiO maser emission pedestal gives the stellar radial velocity. This reinforces the idea that the SiO maser emission pedestal is representative of the true structure of a stellar SiO maser, while the more visible and stronger, narrow SiO emission spikes represent chance coherences along the velocity range of the pedestal. Similarities between the SiO maser velocity patterns of VY CMa and Ori A may suggest similarities in their evolutionary stages.

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