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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.
| UBV absolute CCD photometry and differential astrometry of close visual double stars, with G-type primaries
We present V magnitudes, (B-V) and (U-B) colours of close visual doublestar components, and their differences as well as separations andposition angles of 40 visual double stars. The common properties of themembers of this sample are the small angular separation rho, which isless than 7'', and the common spectral type of the primaries, which areof G-type. The observations made with the Bessel U, B and V filters,while the astrometry was performed in the V filter only. For theobservations, the CCD camera attached to the Cassegrain focus of the 90cm Dutch telescope, at La Silla, Chile, had been used. From the analysisof the data we concluded that from the sample of the fourty double starsobserved seven proved to be physical pairs, while the rest must havecommon origin components. Based on observations made at ESO La Silla,Chile. Tables 1 and 2 are only available in electronic form at the CDSvia anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/Abstract.html
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