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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
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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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Observation and Astrometry data

Constellation:Aquila
Right ascension:20h05m59.57s
Declination:+01°46'53.8"
Apparent magnitude:9.028
Distance:10000000 parsecs
Proper motion RA:-11.1
Proper motion Dec:-9.9
B-T magnitude:9.289
V-T magnitude:9.05

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 190663
TYCHO-2 2000TYC 494-885-1
USNO-A2.0USNO-A2 0900-17678682
HIPHIP 99006
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