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HD 138486


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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.

Photoelectric filter photometry of the flux depression at 5200 A in Ap-stars
A new photometric index was used to characterize the flux depression at5200 A in a photoelectric filter photometric study of a large number ofnormal A-stars, Ap-stars, Am-stars, and Hg-Mn-stars. The new index isdefined as a = g - (h + y)/2, where g and h are the brightnesses at 5240and 5020 A, respectively, measured by interference filters, and y is thebrightness measured with a Stromgren filter. The index reveals a markedcontrast between normal and peculiar stars.

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Osservazione e dati astrometrici

Costellazione:Bilancia
Ascensione retta:15h32m59.90s
Declinazione:-17°14'49.2"
Magnitudine apparente:7.837
Distanza:153.61 parsec
Moto proprio RA:-46.8
Moto proprio Dec:-0.4
B-T magnitude:8.353
V-T magnitude:7.88

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 138486
TYCHO-2 2000TYC 6188-190-1
USNO-A2.0USNO-A2 0675-14372129
HIPHIP 76134

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