Observations of SIO masers in the circumstellar envelopes of late type stars

Details Observations of SIO masers in the circumstellar envelopes of late type stars Observations of SIO masers in the circumstellar envelopes of late type stars

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982phdt.........3l&link_type=abstract

Ph.D. Thesis Massachusetts Univ., Amherst.

Physics

92

Late Stars, Masers, Silicon Oxides, Stellar Envelopes, Line Spectra, Red Shift, Spatial Distribution, Supergiant Stars, Variable Stars, Very Long Base Interferometry

Scientific paper

The properties of silicon monoxide masers toward late type stars were investigated by means of time monitoring studies and very long baseline interferometry. Spectral were obtained in the J = 1.0,v = 1,2, and 3(43 Ghz) and J = 2.1, v = 1 (86 Ghz) transitions of SiO toward twelve long period variables and Orion/IRc2 at twenty-two epochs over a 2.5 year period. The integrated SiO line flux for most sources exhibits both periodic variations which correlate with the stellar infrared light cycle and secular variations. Detailed analysis of the correspondence of velocity structure in different transitions indicates a common location for the J = 1.0 masers in different vibrational states but a different origin for the v = 1, J = 2.1 masers. Line intensity ratios of different transitions are examined in order to further constrain maser pump models.

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