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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
| A NICMOS3 Camera for Fringe Detection at the IOTA Interferometer
We describe a new instrument, based on a NICMOS3 array, for thedetection of interference fringes in the near-infrared at theInfrared-Optical Telescope Array. The camera saw ``first fringes'' inSpring of 1997 and has since been in routine use for a variety ofastrophysical investigations. We present its design characteristics andparameters, which result in magnitude limits for fringe detection ofJ=8.4, H=8.5, and K^'=6.5.
| UBV photometry of stars whose positions are accurately known.
Photometric indices V, B-V, and U-B were measured for about 560 stars ofthe AGK3R and NPZT catalogs between BD declinations 11 deg and 23 deg,using the 40-cm Cassegrain telescope of the Kvistaberg Observatory fromApril 1986 to May 1987. The observation procedure and the reductiontechnique were the same as in the earlier papers of this series by Oja(1984, 1985, 1986, and 1987). The mean errors were calculated from theinternal consistency of the data. The accuracy was found to be the sameas for the earlier parts of the survey.
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Datos observacionales y astrométricos
| Constelación: | Cangrejo |
| Ascensión Recta: | 08h00m32.42s |
| Declinación: | +18°50'35.3" |
| Magnitud Aparente: | 7.09 |
| Distancia: | 182.815 parsecs |
| Movimiento Propio en Ascensión Recta: | -11.6 |
| Movimiento Propio en Declinación: | -9.2 |
| B-T magnitude: | 7.077 |
| V-T magnitude: | 7.089 |
Catálogos y designaciones:
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