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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
| Interstellar extinction in the vicinity of the reflection nebula NGC 1333 in Perseus
The dependence of interstellar extinction on distance in the directionof a dark cloud around the reflection nebula NGC 1333 is determined onthe basis of photoelectric Vilnius photometry and photometricclassification of 78 stars. Two dust clouds are noted at distances 160and 220 pc. The first one, with mean extinction of 0.4 mag, is concludedto belong to the Taurus cloud complex and the second cloud, with meanextinction of 1.8 mag, belongs to the chain of dark clouds and otheryoung objects which is almost perpendicular to the spiral arm but liesabout 80 pc below the Galactic plane. The star BD +30 459 deg, whichilluminates the NGC 1333 nebula, is at a distance 212 pc from the sun.No extinction increase behind the Perseus cloud is detected.
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