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HD 203063


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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.

Visual multiples. VII - MK classifications
Classifications are given for 865 components of visual multiples; theyshow no systematic differences from the MK system, and the random errorsare one subclass in type and two-thirds of a luminosity class. It isfound that at least 1% of the F-type IV and V stars are weak-lined, 32%of the A4-F1 IV and V stars are Am, and 5% of the A0-A3 IV and V starsare early-type Am. Attention is called to the large fraction (55%) ofthe A3-A9 III-V stars that are of luminosity classes III or IV, unlikethe percentage (16%) at neighboring types.

Mesures d'étoiles doubles faites au réfracteur de 38 cm de l'Observatoire de Nice
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观测天体数据

星座:天鵝座
右阿森松:21h18m12.12s
赤纬:+49°55'54.3"
视星:8.286
距离:175.747 天文距离
右阿森松适当运动:14.9
赤纬适当运动:3.6
B-T magnitude:8.455
V-T magnitude:8.3

目录:
适当名称
HD 1989HD 203063
TYCHO-2 2000TYC 3597-1024-1
USNO-A2.0USNO-A2 1350-13816988
HIPHIP 105166

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