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HD 117850


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VRI photometry of wide double stars with A- type primaries.
We are presenting VRI photometry of 93 wide visual double stars havinglate B- or A- type primaries, taken from the Annex of Double andMultiple Stars of the HIPPARCOS Input Catalogue. Spectral types havebeen estimated for most of the primaries and for the majority of thesecondaries. 40% of them probably have common origin components, forwhich we calculated photometric parallaxes and some orbital valuesestimates.

A homogeneous catalog of new UBV and H-beta photometry of B- and A-type stars in and around the Scorpius-Centaurus OB association
B- and A-type stars in and near the Sco-Cen OB association areinvestigated with UBV and H-beta photometry to acquire data relevant tothe luminosity function of Sco-Cen. The measurements generally consistof two 10-s integrations of U, B, V, (W, N) filters, and theobservations are corrected iteratively for atmospheric extinction andinstrumental response. The data presented give the mean V magnitude,mean B-V, mean U-B, and the estimated uncertainties for these values.The catalog provides a homogeneous catalog of data for a large fieldwith stellar objects delineating membership to the association Sco-Cenand that affect the luminosity function of the aggregate.

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Observation and Astrometry data

Constellation:Centaurus
Right ascension:13h33m45.07s
Declination:-38°15'29.3"
Apparent magnitude:8.161
Distance:283.286 parsecs
Proper motion RA:5.9
Proper motion Dec:1.7
B-T magnitude:8.289
V-T magnitude:8.172

Catalogs and designations:
Proper Names
HD 1989HD 117850
TYCHO-2 2000TYC 7788-1557-1
USNO-A2.0USNO-A2 0450-15882683
HIPHIP 66163

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