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HD 110225


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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.

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.

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Observation and Astrometry data

Constellation:Ύδρα
Right ascension:12h40m51.46s
Declination:-27°42'47.6"
Apparent magnitude:7.568
Distance:192.678 parsecs
Proper motion RA:-24.2
Proper motion Dec:1.1
B-T magnitude:7.53
V-T magnitude:7.565

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 110225
TYCHO-2 2000TYC 6691-1313-1
USNO-A2.0USNO-A2 0600-15073560
HIPHIP 61884

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