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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.
| Physical parameters of pulsating variables with periods between one and three days. I - Photometry and metallicities
Based on a new set of observations in the Walraven VBLUW system,obtained at the European Southern Observatory, La Silla, Chile,Fe/H(VBLU) values of 57 pulsating variables, mostly with periods betweenone and three days,. are determined. The distribution of the metalabundances is shown to be essentially bimodal. All the variables withFe/H ratios of less than -0.4 were classified by Diethelm (1983) as RRdstars. They are identified as the galactic field counterpart of theCepheids in the same period range found in globular clusters.
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Observation and Astrometry data
| Constellation: | みなみのかんむり座 |
| Right ascension: | 18h59m41.45s |
| Declination: | -40°37'21.8" |
| Apparent magnitude: | 7.717 |
| Distance: | 238.663 parsecs |
| Proper motion RA: | 3.6 |
| Proper motion Dec: | -10.4 |
| B-T magnitude: | 7.701 |
| V-T magnitude: | 7.716 |
Catalogs and designations:
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