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The 8 micron band of silicon monoxide in the expanding cloud around VY Canis MajorisObservations 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.
Document ID
19790051629
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Geballe, T. R. (Hale Observatories Pasadena, Calif., United States)
Lacy, J. H. (Hale Observatories Pasadena, CA, United States)
Beck, S. C. (California, University Berkeley, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
May 15, 1979
Publication Information
Publication: Astrophysical Journal
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NGL-05-003-272
CONTRACT_GRANT: NSF AST-77-12256
Distribution Limits
Public
Copyright
Other