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HD 62811


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Monitoring of spotted RS CVn and BY Dra type stars. I. Simultaneous optical and infrared photometry
UBV(RI)cJHK photometry of 6 active stars, collected at theSouth African Astronomical Observatory in 1996 and 1997, is presented.The light and colour curves, which are compared with those observed atprevious epochs, show significant variation in their wave-likemodulation and in their maximum brightness.

Radial velocities. Measurements of 2800 B2-F5 stars for HIPPARCOS
Radial velocities have been determined for a sample of 2930 B2-F5 stars,95% observed by the Hipparcos satellite in the north hemisphere and 80%without reliable radial velocity up to now. Observations were obtainedat the Observatoire de Haute Provence with a dispersion of 80Ä,mm(-1) with the aim of studying stellar and galactic dynamics.Radial velocities have been measured by correlation with templates ofthe same spectral class. The mean obtained precision is 3.0 km s(-1)with three observations. A new MK spectral classification is estimatedfor all stars. Based on observations made at the Haute ProvenceObservatory, France and on data from The Hipparcos Catalogue, ESA.Tables 4, 5 and 6 are only available in electronic form at the CDS viaanonymous ftp to cdsarc.u-strasbg.fr or viahttp://cdsweb.u-strasbg.fr/Abstract.htm

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Datos observacionales y astrométricos

Constelación:Can Menor
Ascensión Recta:07h45m47.63s
Declinación:+02°33'35.4"
Magnitud Aparente:7.965
Distancia:326.797 parsecs
Movimiento Propio en Ascensión Recta:-4.2
Movimiento Propio en Declinación:-6.7
B-T magnitude:7.968
V-T magnitude:7.966

Catálogos y designaciones:
Nombres Propios
HD 1989HD 62811
TYCHO-2 2000TYC 184-258-1
USNO-A2.0USNO-A2 0900-05375437
HIPHIP 37874

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