Infrared observations of circumstellar ammonia in OH/IR supergiants

Details Infrared observations of circumstellar ammonia in OH/IR supergiants Infrared observations of circumstellar ammonia in OH/IR supergiants

Sep 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...240l.159m&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 240, Sept. 15, 1980, p. L159-L163. Research supported by the Natural

Astronomy and Astrophysics

Astronomy

18

Ammonia, Hydroxyl Emission, Infrared Astronomy, Infrared Stars, Stellar Envelopes, Stellar Spectra, Supergiant Stars, Infrared Spectra, Line Spectra, Stellar Mass Ejection

Scientific paper

Ammonia 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.

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