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HD 105646


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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.

Estimation of spectral classifications for bright southern stars with interesting Stromgren indices
This paper investigates the degree of success with which uvby photometrycan be applied to predict spectral classifications for 947 A, F, and Gstars brighter than an apparent magnitude of 8.3 and with four-colorindices indicating some kind of interesting, unusual, or peculiarspectrum. One or several possible spectral classifications are estimatedfor each star from photometry alone, double stars are distinguished, andthe estimates are compared with published classifications. The resultsshow that the framework provided by uvby photometry can be extended toinclude most G and K stars, reddened stars, peculiar stars, and certaintypes of double star.

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Osservazione e dati astrometrici

Costellazione:Centauro
Ascensione retta:12h09m46.63s
Declinazione:-51°47'01.7"
Magnitudine apparente:6.874
Distanza:598.802 parsec
Moto proprio RA:-3.2
Moto proprio Dec:0.9
B-T magnitude:8.244
V-T magnitude:6.988

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 105646
TYCHO-2 2000TYC 8241-3238-1
USNO-A2.0USNO-A2 0375-15289972
HIPHIP 59290

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