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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.
| Radial velocity measurements. II - Ground-based observations of the program stars for the HIPPARCOS satellite New radial velocities for 446 stars of magnitude 9.0 or brighter in 1616-sq-deg fields of the Northern Hemisphere are determined by automaticPDS measurement of 80-A/mm-dispersion spectra obtained at theObservatoire de Haute Provence using a 17-cm-diameter objective prism.The fields were selected to provide data for the input catalog of theESA Hipparcos astrometric satellite. The measurement techniques andprecision are discussed, and the results are presented in extensivetables and graphs.
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Osservazione e dati astrometrici
Costellazione: | Perseo |
Ascensione retta: | 03h25m37.70s |
Declinazione: | +45°30'56.0" |
Magnitudine apparente: | 7.511 |
Distanza: | 467.29 parsec |
Moto proprio RA: | 5 |
Moto proprio Dec: | -3.6 |
B-T magnitude: | 7.557 |
V-T magnitude: | 7.515 |
Cataloghi e designazioni:
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