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Walraven photometry of nearby southern OB associations
Homogeneous Walraven (VBLUW) photometry is presented for 5260 stars inthe regions of five nearby southern OB associations: Scorpio Centaurus(Sco OB2), Orion OB1, Canis Major OB1, Monoceros OB1, and Scutum OB2.Derived V and (B - V) in the Johnson system are included.

The region of NGC 2287 and CR 121
Intermediate band and H-beta observations of 135 stars in the regions ofthe clusters NGC 2287 and Cr 121 are discussed, and a luminositycalibration of photometric parameters for late G- to early K-type brightgiants and supergiants is introduced. Results indicate that NGC 2287 isat a distance of 740 pc, very little reddened, 100-million years old,and contains three or four G8-K2 bright giants and supergiants and ablue straggler. Cr 121 is 1.17 kpc distant, very little reddened, 1.5million years old and an extension of CMa OB1. Cr 121 contains a nearerconcentration of stars at the same distance as NGC 2287, and theassociation appears to be the same age as CMa OB1, although presequencestars may exist. Intermingling of stars in CMa OB2 and NGC 2287 is alsoconsidered possible, and a test of the calibration of two methods ofluminosity determination of early A-type stars using photometricparameters shows them to be entirely consistent.

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Dades d'Observació i Astrometria

Constel·lació:Canis Major
Ascensió Recta:06h56m19.49s
Declinació:-21°41'54.2"
Magnitud Aparent:9.703
Moviment propi RA:2.1
Moviment propi Dec:2
B-T magnitude:9.851
V-T magnitude:9.716

Catàlegs i designacions:
Noms Propis   (Edit)
HD 1989HD 51382
TYCHO-2 2000TYC 5975-121-1
USNO-A2.0USNO-A2 0675-04273991
HIPHIP 33362

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