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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.
| Uvby-beta photometry of stars in the Michigan Spectral Catalogue. I - The Delta Del stars
uvby-beta photometry of 74 stars classified as Delta Del in Volume 1 ofthe Michigan Spectral Catalogue is presented. The photometry is inagreement with the spectral classification in that it indicates DeltaDel stars are metal-line-enhanced stars with equivalent-temperaturetypes of A9 + or - 2 subtypes. There is a discrepancy between theluminosity implied from the delta c1 index and the spectralclassification. It is argued that c1 is an inadequateluminosity indicator for some late A- to early F-type stars. Several ofthe Delta Del stars are known Delta Scuti pulsators, and some commentson the metallicism-pulsation relation are made.
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Observation and Astrometry data
| Constellation: | りゅうこつ座 |
| Right ascension: | 11h04m32.99s |
| Declination: | -67°44'11.5" |
| Apparent magnitude: | 8.987 |
| Distance: | 234.742 parsecs |
| Proper motion RA: | -25.2 |
| Proper motion Dec: | 8.2 |
| B-T magnitude: | 9.563 |
| V-T magnitude: | 9.035 |
Catalogs and designations:
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