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HD 112791


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Radial velocities of population II binary stars. I.
Radial velocities for 114 Hipparcos stars, mostly high transversevelocity binaries without previous radial velocity measurements, arepublished. Measurements are made with the CORAVEL-type radial velocityspectrometer. The accuracy of measurements is better than 1 km/s. Twostars, BD +30 deg 2129A and HD 117466AB are found to be radial velocityvariables, and three more stars, HD 119515A, HD 131597AB, and HD 153344,are possible radial velocity variables.

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.

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Berenisin Saci
Sað Açýklýk:12h59m10.33s
Yükselim:+14°53'54.0"
Görünürdeki Parlaklýk:9.127
özdevim Sað Açýklýk:34.8
özdevim Yükselim:-172.3
B-T magnitude:9.788
V-T magnitude:9.182

Kataloglar ve belirtme:
Özgün isimleri
HD 1989HD 112791
TYCHO-2 2000TYC 889-1117-1
USNO-A2.0USNO-A2 0975-07083200
HIPHIP 63378

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