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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.

The distance and structure of the Coalsack. I - Photometric data
The results of UBV and H-beta photometry for 284 stars of spectral typesB to F located in the area of the dark cloud Coalsack are presented.Most of the present stars are brighter than 10.0 mag and are classifiedin the MK system of Houk and Cowley (1975). For each star, the bestvalues for the extinction and distance modulus are provided, withtypical estimated errors of + or - 0.08 mag for the extinction and + or- 0.32 mag for the distance modulus. Possible misclassifications andspectral peculiarities are noted for several of the stars.

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Dades d'Observació i Astrometria

Constel·lació:Centaurus
Ascensió Recta:13h13m47.03s
Declinació:-64°18'47.7"
Magnitud Aparent:7.811
Distancia:211.416 parsecs
Moviment propi RA:-10.3
Moviment propi Dec:-11
B-T magnitude:8.004
V-T magnitude:7.827

Catàlegs i designacions:
Noms Propis   (Edit)
HD 1989HD 114738
TYCHO-2 2000TYC 8998-1531-1
USNO-A2.0USNO-A2 0225-16369046
HIPHIP 64546

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