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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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Observation and Astrometry data

Constellation:Libra
Right ascension:15h32m59.90s
Declination:-17°14'49.2"
Apparent magnitude:7.837
Distance:153.61 parsecs
Proper motion RA:-46.8
Proper motion Dec:-0.4
B-T magnitude:8.353
V-T magnitude:7.88

Catalogs and designations:
Proper Names
HD 1989HD 138486
TYCHO-2 2000TYC 6188-190-1
USNO-A2.0USNO-A2 0675-14372129
HIPHIP 76134

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