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Two-colour photometry for 9473 components of close Hipparcos double and multiple stars
Using observations obtained with the Tycho instrument of the ESAHipparcos satellite, a two-colour photometry is produced for componentsof more than 7 000 Hipparcos double and multiple stars with angularseparations 0.1 to 2.5 arcsec. We publish 9473 components of 5173systems with separations above 0.3 arcsec. The majority of them did nothave Tycho photometry in the Hipparcos catalogue. The magnitudes arederived in the Tycho B_T and V_T passbands, similar to the Johnsonpassbands. Photometrically resolved components of the binaries withstatistically significant trigonometric parallaxes can be put on an HRdiagram, the majority of them for the first time. Based on observationsmade with the ESA Hipparcos satellite.
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We publish 1879 radial velocities of stars distributed in 105 fields of4^{\circ} \times 4^{\circ}. We continue the PPO series \cite[(Fehrenbachet al. 1987;]{Feh87} \cite[Duflot et al. 1990, 1992 and 1995),]{Du90}using the Fehrenbach objective prism method. Table 1 only available inelectronic form at CDS via to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/Abstract.html
| Über die Veränderlichkeit der Sterne des Spektraltyps A
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Miembro de los siguientes grupos:
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Datos observacionales y astrométricos
| Constelación: | Hércules |
| Ascensión Recta: | 17h37m40.99s |
| Declinación: | +42°50'01.4" |
| Magnitud Aparente: | 7.888 |
| Distancia: | 223.214 parsecs |
| Movimiento Propio en Ascensión Recta: | -5.9 |
| Movimiento Propio en Declinación: | 5 |
| B-T magnitude: | 7.97 |
| V-T magnitude: | 7.895 |
Catálogos y designaciones:
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