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HD 201320


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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.

Empirical temperature calibrations for early-type stars
Three temperature calibrations of suitable photometric quantities havebeen derived for O and B stars. A sample of 120 stars with reliableT(eff.) determinations has been used for establishing each calibration.The different calibrations have been critically discussed and compared.Temperature determinations for 1009 program stars have been obtainedwith an accuracy of the order of 10 percent.

Visual multiples. VII - MK classifications
Classifications are given for 865 components of visual multiples; theyshow no systematic differences from the MK system, and the random errorsare one subclass in type and two-thirds of a luminosity class. It isfound that at least 1% of the F-type IV and V stars are weak-lined, 32%of the A4-F1 IV and V stars are Am, and 5% of the A0-A3 IV and V starsare early-type Am. Attention is called to the large fraction (55%) ofthe A3-A9 III-V stars that are of luminosity classes III or IV, unlikethe percentage (16%) at neighboring types.

V1500 Cygni Nova 1975
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Light curve of Nova V1500 CYG 1975.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1976ApJ...209..882Y&db_key=AST

Catalogue d'etoiles O et B.
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Etude pour chaque champ de l'absorption et de la repartition des vitesses radiales EN fonction de la distance.
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Observation and Astrometry data

Constellation:Cygnus
Right ascension:21h07m13.37s
Declination:+47°44'03.6"
Apparent magnitude:7.321
Distance:330.033 parsecs
Proper motion RA:7.2
Proper motion Dec:11
B-T magnitude:7.365
V-T magnitude:7.325

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 201320
TYCHO-2 2000TYC 3592-1058-1
USNO-A2.0USNO-A2 1350-13479665
HIPHIP 104245

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