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HD 21540


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uvby - β Photoelectric Photometry of the Open Cluster α Per
Absolute photoelectric photometry of stars in the direction of the OpenCluster α Per has been secured and is presented along with ananalysis reinforced with all the available data in Strömgrenuvby-β photometry compiled from the literature. Cluster membershipis analyzed and the physical characteristics of the stars have beendeduced. The membership determined in this paper is compared with thatof proper motion studies and Hipparcos.

Spectral Classification of Stars in A Supplement to the Bright Star Catalogue
MK spectral types are given for about 584 stars in A Supplement to theBright Star Catalogue. These are compared with Hipparcos parallaxes tocheck the reliability of those classifications. The estimated errors are+/-1.2 subtypes, and 10% of the luminosity classes may be wrong.

Vitesses radiales. Catalogue WEB: Wilson Evans Batten. Subtittle: Radial velocities: The Wilson-Evans-Batten catalogue.
We give a common version of the two catalogues of Mean Radial Velocitiesby Wilson (1963) and Evans (1978) to which we have added the catalogueof spectroscopic binary systems (Batten et al. 1989). For each star,when possible, we give: 1) an acronym to enter SIMBAD (Set ofIdentifications Measurements and Bibliography for Astronomical Data) ofthe CDS (Centre de Donnees Astronomiques de Strasbourg). 2) the numberHIC of the HIPPARCOS catalogue (Turon 1992). 3) the CCDM number(Catalogue des Composantes des etoiles Doubles et Multiples) byDommanget & Nys (1994). For the cluster stars, a precise study hasbeen done, on the identificator numbers. Numerous remarks point out theproblems we have had to deal with.

The radial velocities., luminosities of 77 stars in the field of the alf Per cluster.
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Eigenbewegungen in der Umgebung von α Persei
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Osservazione e dati astrometrici

Costellazione:Perseo
Ascensione retta:03h30m26.99s
Declinazione:+47°03'47.8"
Magnitudine apparente:7.046
Distanza:763.359 parsec
Moto proprio RA:7.7
Moto proprio Dec:-5.7
B-T magnitude:7.162
V-T magnitude:7.056

Cataloghi e designazioni:
Nomi esatti
HD 1989HD 21540
TYCHO-2 2000TYC 3316-1347-1
USNO-A2.0USNO-A2 1350-03524725
HIPHIP 16326
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