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HD 53227


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UVBY beta photometry of peculiar B and A stars, discovered at Abastumani
Stromgren uvby photometry for 70 peculiar Bp, Ap, or Am type stars ispresented. The model grid of Relyea and Kurucz (1978) is used to obtaineffective temperatures and log g values, confirming the dwarf-nature ofAm stars. Good agreement is found between effective temperatures andequivalent spectral classes derived from the (b-y)0 values, although theA4-A5 stars in this sample may be cooler than normal stars ofluminosity-class III-V in this spectral range.

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

Slit Spectra of Some Peculiar and Metallic-Line A Stars
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Observation and Astrometry data

Constellation:Luchs
Right ascension:07h07m49.93s
Declination:+58°31'42.0"
Apparent magnitude:8.792
Distance:180.18 parsecs
Proper motion RA:7.1
Proper motion Dec:3.8
B-T magnitude:9.049
V-T magnitude:8.814

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 53227
TYCHO-2 2000TYC 3792-2257-1
USNO-A2.0USNO-A2 1425-06834634
HIPHIP 34389

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