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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
| Photoelectric Observations of X Persei
Not Available
| The Preliminary Results of Near Infrared Occultation
Not Available
| Radial velocity measurements. I - Ground-based observations of the program stars for the HIPPARCOS satellite
The radial velocities of 272 stars brighter than m(pg) = 8.5 aredetermined by digital microphotometric measurement of plates obtainedwith dispersion 80 A/mm using the Marly slit spectrograph on the 120-cmtelescope of the Observatoire de Haute Provence. The objects wereselected as probable members of the input catalog for the ESA Hipparcosastrometric satellite. The measurement techniques and data-reductionprocedures are described in detail, and the results are presented inextensive tables and graphs and briefly characterized.
| Photometry of X Persei in late 1978
X Persei optical intensity has been monitored during seven consecutivenights in late 1978. Observations included the usual UBV broad bands aswell as narrow bands around H-beta and He II 4686. Some activity ofabout 0.05 mag., on a time scale of several hours has been detected,mainly in the U-band. Here, as in previous observations, no clearperiodicity is apparent, including the probable period of 11.2h or 22.4hof the assumed companion 3U0352 + 30. The upper limit of 0.02 mag.coherent modulation of H-beta emission makes these periods unlikely.
| Uvbyβ Photometry of Stars in the Direction of the Association Perseus OB 2
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1971PASP...83..656R&db_key=AST
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| Takýmyýldýz: | Boga |
| Sað Açýklýk: | 03h50m09.95s |
| Yükselim: | +29°38'39.4" |
| Görünürdeki Parlaklýk: | 7.803 |
| Uzaklýk: | 307.692 parsek |
| özdevim Sað Açýklýk: | -1.7 |
| özdevim Yükselim: | -15.4 |
| B-T magnitude: | 7.931 |
| V-T magnitude: | 7.814 |
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