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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.
| CCD photometry and astrometry of visual double and multiple stars of the HIPPARCOS Catalogue. II. CCD photometry and differential astrometry of 288 southern ``Intermediate'' systems
We present photometric and astrometric data of about 280 visual doublestars of the ``intermediate'' class, i.e. with angular separationsmainly in the range 2arcsec < rho < 12arcsec . The observationshave been obtained in 1991-92 with a CCD camera attached to the 91 cmDutch telescope at ESO La Silla, Chile. Differential magnitudes of thedouble star components as well as magnitudes and colour indices of theindividual components have been determined in the Cousins V and Ipassbands with an internal error of about 0.005 mag and an externalaccuracy of less than 0.03 mag. In addition, angular separations havebeen secured to an internal accuracy of 0.004arcsec and position anglesto about 0.05degr. Tables 1 to 4 are only available in electronic format the CDS via ftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/Abstract.html. Based on observationscollected at the European Southern Observatory, La Silla, Chile.
| An improved spectroscopic orbit for the white dwarf eclipsing binary BD +16 deg 516
Original spectrograms plus newly acquired ones have been remeasured andanalyzed along with numerous standard stars to provide a more definitiveorbit solution and center-of-mass radial velocity for this importantbinary. Evidence from the Ca II emission lines suggests that achromospheric 'event' may have been observed which is related to massexchange.
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| Takýmyýldýz: | Agcik |
| Sað Açýklýk: | 03h49m32.42s |
| Yükselim: | -55°20'55.7" |
| Görünürdeki Parlaklýk: | 10.385 |
| özdevim Sað Açýklýk: | 5.5 |
| özdevim Yükselim: | 20.9 |
| B-T magnitude: | 10.85 |
| V-T magnitude: | 10.424 |
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