The 8 micron band of silicon monoxide in the expanding cloud around VY Canis Majoris

Details The 8 micron band of silicon monoxide in the expanding cloud around VY Canis Majoris The 8 micron band of silicon monoxide in the expanding cloud around VY Canis Majoris

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...230l..47g&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 230, May 15, 1979, p. L47-L51.

Astronomy and Astrophysics

Astrophysics

21

Absorption Spectra, Abundance, Infrared Spectra, Silicon Oxides, Stellar Envelopes, Stellar Spectra, Line Spectra, Stellar Structure, Variable Stars

Scientific paper

Observations of vibration-rotation transitions of silicon monoxide in VY CMa show that the lines originate in accelerating, expanding, and cool (about 600 K) layers of a circumstellar cloud at a distance of approximately 0.15 arcsec from the central star. The central stellar velocity, as estimated from observed SiO P Cygni line profiles, is somewhat redshifted from the midpoint of the maser emission features. Most of the silicon is probably in the form of dust grains. The isotopic ratios of silicon are nearly terrestrial.

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