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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. Not Available
Eigenbewegungen in der Umgebung von α Persei Not Available

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观测天体数据

星座:	英仙座
右阿森松:	03^h30^m26.99^s
赤纬:	+47Â°03'47.8"
视星:	7.046
距离:	763.359 天文距离
右阿森松适当运动:	7.7
赤纬适当运动:	-5.7
B-T magnitude:	7.162
V-T magnitude:	7.056

目录:

适当名称
HD 1989	HD 21540
TYCHO-2 2000	TYC 3316-1347-1
USNO-A2.0	USNO-A2 1350-03524725
HIP	HIP 16326

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