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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.
| Local photometric standards for CaII emission stars
UBV data are given for 108 stars which are suitable local standards for52 stars with strong Ca2 emissions. An additional eight stars wererejected as possible standards because of suspected variability.
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| Сазвежђа: | Октант |
| Ректацензија: | 20h47m29.32s |
| Deклинација: | -80°19'27.2" |
| Apparent магнитуда: | 8.5 |
| Даљина: | 253.807 parsecs |
| Proper motion RA: | 26.6 |
| Proper motion Dec: | 2.1 |
| B-T magnitude: | 8.907 |
| V-T magnitude: | 8.534 |
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