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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:
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