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uvby FCAPT photometry of the mCP stars HR 2258, MW Vul, and HR 9017 and the HgMn star 46 ρ Aqr
Differential Strömgren uvby observations from the Four CollegeAutomated Photoelectric Telescope are presented for the magnetic CP(mCP) stars HR 2258, MW Vul, and HR 9017 and the HgMn star 46 ρ Aqr.A period for HR 2258 of 15.0313 days satisfactorily phases photometryover a 30 year time span. Recent observations of MW Vul agree in phasingwith those taken 13 years ago, but the amplitudes in u, v, b, and y aregreater and the light curves have changed shape especially in thefalling branch. This type of behavior has not been seen before in anyslowly rotating mCP star. It is a signature of the precession of therotational axis which brings different parts of the surface into view. Aperiod of 0.92738 days is found for HR 9017 which is similar to thatderived by Winzer. Changes in the v-c values between observations takenin the Spring and Fall of 2003 for 46 ρ Aqr may be due to itscompanion.Tables 2-4 and 6 are only available in electronic form at the CDS viaanonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/429/317
| 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
| UvbyHbeta_ photometry of main sequence A type stars.
We present Stroemgren uvby and Hbeta_ photometry for a set of575 northern main sequence A type stars, most of them belonging to theHipparcos Input Catalogue, with V from 5mag to 10mag and with knownradial velocities. These observations enlarge the catalogue we began tocompile some years ago to more than 1500 stars. Our catalogue includeskinematic and astrophysical data for each star. Our future goal is toperform an accurate analysis of the kinematical behaviour of these starsin the solar neighbourhood.
| Etude pour chaque champ de l'absorption et de la repartition des vitesses radiales EN fonction de la distance.
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| La mesure des vitesses radiales auprisme objectif. VI. -Liste des vitesses radiales déterminées au prisme objectif à vision directe
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| Takýmyýldýz: | Zincirli Prenses |
| Sað Açýklýk: | 23h50m59.24s |
| Yükselim: | +63°59'05.5" |
| Görünürdeki Parlaklýk: | 6.801 |
| Uzaklýk: | 220.264 parsek |
| özdevim Sað Açýklýk: | -17.8 |
| özdevim Yükselim: | -2.4 |
| B-T magnitude: | 6.871 |
| V-T magnitude: | 6.807 |
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