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Infrared observations of circumstellar ammonia in OH/IR supergiantsAmmonia has been detected in the circumstellar envelopes of VY Canis Majoris, VX Sagittarii, and IRC +10420 by means of several absorption lines in the nu-2 vibration-rotation band near 950 kaysers. The line profiles are well resolved (0.2 km/sec resolution) and show the gas being accelerated to terminal expansion velocities near 30 km/sec. The observations reveal a method for determining the position of the central star on VLBI maps of OH maser emission to an accuracy of approximately 0.2 arcsec. A firm lower limit of 2 x 10 to the 15th/sq cm is obtained for the NH3 column density in VY Canis Majoris.
Document ID
19810029636
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Mclaren, R. A. (Toronto, University; David Dunlap Observatory, Toronto, Canada)
Betz, A. L. (California University Berkeley, Calif., United States)
Date Acquired
August 11, 2013
Publication Date
September 15, 1980
Publication Information
Publication: Astrophysical Journal
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NSF AST-78-24453
CONTRACT_GRANT: NGR-05-003-452
Distribution Limits
Public
Copyright
Other