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HD 46825

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UvbyHbeta_ photometry of main sequence A type stars. We present Stroemgren uvby and Hbeta_ photometry for a set of575 northern main sequence A type stars, most of them belonging to theHipparcos Input Catalogue, with V from 5mag to 10mag and with knownradial velocities. These observations enlarge the catalogue we began tocompile some years ago to more than 1500 stars. Our catalogue includeskinematic and astrophysical data for each star. Our future goal is toperform an accurate analysis of the kinematical behaviour of these starsin the solar neighbourhood.
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
Catalogue et bibliographie des étoiles A à spectre particulier - Deuxième supplément Not Available
Catalogue et bibliographie des étoiles A à spectre particulier Premier supplément Not Available
Peculiar and Metallic-Line a - Stars in a Galactic Zone. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1959ApJ...129...88S&db_key=AST

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:	Ikizler
Sað Açýklýk:	06^h36^m04.39^s
Yükselim:	+13Â°41'38.5"
Görünürdeki Parlaklýk:	7.239
Uzaklýk:	114.155 parsek
özdevim Sað Açýklýk:	-17.9
özdevim Yükselim:	-6.6
B-T magnitude:	7.546
V-T magnitude:	7.265

Kataloglar ve belirtme:

Özgün isimleri	(Edit)
HD 1989	HD 46825
TYCHO-2 2000	TYC 745-981-1
USNO-A2.0	USNO-A2 0975-03507139
HIP	HIP 31531

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