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HD 191056


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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.

Photographic observations of visual double stars.
We present the results of photographic observations of 399 visual doublestars of the Hipparcos Input Catalogue (HIC), observed in the years 1980and 1990-1991 with the 60-cm double-refractor of the Bosscha Observatoryat Lembang, Java.

Rotational velocities and spectral types for a sample of binary systems.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1975A&AS...19...91L&db_key=AST

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Tavus
Sað Açýklýk:20h11m50.71s
Yükselim:-63°37'01.2"
Görünürdeki Parlaklýk:8.194
Uzaklýk:10000000 parsek
özdevim Sað Açýklýk:11.1
özdevim Yükselim:-9.6
B-T magnitude:8.247
V-T magnitude:8.199

Kataloglar ve belirtme:
Özgün isimleri
HD 1989HD 191056
TYCHO-2 2000TYC 9090-1623-1
USNO-A2.0USNO-A2 0225-30596024
HIPHIP 99521

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