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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
| DQ Cephei, a Delta Scuti star of constant variability
The light curves of many Delta Scuti stars appear variable from cycle tocycle, but this complexity may be only apparent and caused by theinteraction of two or more pulsation modes with definite, constantperiods. The present analysis of differential photoelectric photometryfor the Delta Scuti star DQ Cephei yields two frequencies, 8.0603 and12.6788 c/d, which adjust well to observations covering a span of 29years.
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