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HD 181495

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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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Osservazione e dati astrometrici

Costellazione:	Aquila
Ascensione retta:	19^h20^m22.18^s
Declinazione:	+09Â°12'57.8"
Magnitudine apparente:	9.871
Moto proprio RA:	12.7
Moto proprio Dec:	-14.4
B-T magnitude:	12.237
V-T magnitude:	10.067

Cataloghi e designazioni:

Nomi esatti	(Edit)
HD 1989	HD 181495
TYCHO-2 2000	TYC 1042-481-1
USNO-A2.0	USNO-A2 0975-14593540

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