HD 181495

Infrared observations of circumstellar ammonia in OH/IR supergiants Ammonia has been detected in the circumstellar envelopes of VY CanisMajoris, VX Sagittarii, and IRC +10420 by means of several absorptionlines in the nu-2 vibration-rotation band near 950 kaysers. The lineprofiles are well resolved (0.2 km/sec resolution) and show the gasbeing accelerated to terminal expansion velocities near 30 km/sec. Theobservations reveal a method for determining the position of the centralstar on VLBI maps of OH maser emission to an accuracy of approximately0.2 arcsec. A firm lower limit of 2 x 10 to the 15th/sq cm is obtainedfor the NH3 column density in VY Canis Majoris.
Classification of 831 two-micron sky survey sources south of +5 degrees. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1975AJ.....80.1011H&db_key=AST
The Distribution of the BD M-Type Stars Along the Galactic Equator. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1958ApJ...128..510N&db_key=AST
The Distribution of Late M-Type Stars Along the Galactic Equator. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1956ApJ...124..522N&db_key=AST

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