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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: | Delphinus |
Right ascension: | 20h22m37.76s |
Declination: | +18°56'04.5" |
Apparent magnitude: | 8.568 |
Proper motion RA: | 5.8 |
Proper motion Dec: | -14.1 |
B-T magnitude: | 8.674 |
V-T magnitude: | 8.577 |
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