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HD 190663

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Lists of photometric AM candidates The Geneva photometric m parameter (Nicolet and Cramer, 1982) is used inorder to select Am photometric candidates from the Rufener (1981)catalogue. Two lists are given, the first containing field stars and thesecond cluster stars. According to the photometric criteria thediffusion process probably responsible for the Am phenomenon takes placerather quickly as Am candidates are present in young clusters. It isconfirmed that the phenomenon is enhanced by low rotational velocity andhigh metallicity. The age seems to slightly affect the Am phenomenon.
Multicolor photometry of metallic-line stars. III. A photometric catalogue Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1974RMxAA...1..175M&db_key=AST
Catalogue et bibliographie des étoiles A à spectre particulier - Deuxième supplément Not Available
Rotational velocities of faint stars of early spectral types. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1963AJ.....68..428S&db_key=AST

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Osservazione e dati astrometrici

Costellazione:	Aquila
Ascensione retta:	20^h05^m59.57^s
Declinazione:	+01Â°46'53.8"
Magnitudine apparente:	9.028
Distanza:	10000000 parsec
Moto proprio RA:	-11.1
Moto proprio Dec:	-9.9
B-T magnitude:	9.289
V-T magnitude:	9.05

Cataloghi e designazioni:

Nomi esatti	(Edit)
HD 1989	HD 190663
TYCHO-2 2000	TYC 494-885-1
USNO-A2.0	USNO-A2 0900-17678682
HIP	HIP 99006

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