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HD 150080


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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.

An infrared study of the Ophiuchus dark cloud
A near-infrared survey has been conducted of nearly 18 square degrees ofthe Ophiuchus dark cloud complex. Additional observations have been madeof selected objects found in this survey and of the brighter objectsfound by Grasdalen et al. and by Vrba et al. in this region in order toidentify and study the young stars associated with the cloud. Theseobservations show that very recent star formation has been largelyrestricted to a small region at the center of the dark cloud complex, nomore than a few parsecs in extent. Most of the young stars do not appearto be main-sequence stars. At least three of these objects appear to besurrounded by infrared reflection nebulae. Many of the objects studiedare background K and M giants which can be used to determine thenear-infrared extinction due to the cloud.

New H-alpha emission stars in a region to the east of the T-Association near rho Ophiuchi.
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Observation and Astrometry data

Constellation:Scorpius
Right ascension:16h39m40.98s
Declination:-25°00'30.6"
Apparent magnitude:9.318
Proper motion RA:-8.4
Proper motion Dec:-7.2
B-T magnitude:9.771
V-T magnitude:9.356

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 150080
TYCHO-2 2000TYC 6800-268-1
USNO-A2.0USNO-A2 0600-21123343
HIPHIP 81582

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