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HD 195991

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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.
Properties of AM stars in the Geneva photometric system Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1980A&A....92..289H&db_key=AST
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 of AM stars with known spectral types Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1973A&AS...10..385H&db_key=AST
Classification des spectres de 112 d'étoiles A et F dont 89 d'étoiles AM Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1970A&AS....1....7B&db_key=AST
Catalogue et bibliographie des étoiles A à spectre particulier - Deuxième supplément Not Available
Thirty-seven New Peculiar and Metallic-Line A Stars Not Available

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Osservazione e dati astrometrici

Costellazione:	Cigno
Ascensione retta:	20^h33^m15.11^s
Declinazione:	+35Â°59'21.9"
Magnitudine apparente:	8.866
Distanza:	301.205 parsec
Moto proprio RA:	18.8
Moto proprio Dec:	16.7
B-T magnitude:	9.214
V-T magnitude:	8.895

Cataloghi e designazioni:

Nomi esatti	(Edit)
HD 1989	HD 195991
TYCHO-2 2000	TYC 2698-1252-1
USNO-A2.0	USNO-A2 1200-15314505
HIP	HIP 101426

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