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HD 31732


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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.

The calibration of the Stromgren photometric system for A, F and early G supergiants. I - The observational data
An empirical calibration of the Stromgren uvby-beta photometric systemfor the A, F, and early G supergiants is being derived. This paperexplains the observational program and the photometric reductiontechniques used and presents a catalog of new Stromgren photometry forover 600 A, F, and G supergiants.

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Observation and Astrometry data

Constellation:Dorado
Right ascension:04h54m30.52s
Declination:-60°24'51.6"
Apparent magnitude:8.86
Distance:217.865 parsecs
Proper motion RA:0.7
Proper motion Dec:3.9
B-T magnitude:9.364
V-T magnitude:8.902

Catalogs and designations:
Proper Names
HD 1989HD 31732
TYCHO-2 2000TYC 8877-689-1
USNO-A2.0USNO-A2 0225-01417973
HIPHIP 22814

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