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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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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Yilanci |
| Sað Açýklýk: | 17h43m29.12s |
| Yükselim: | +03°38'19.1" |
| Görünürdeki Parlaklýk: | 9.851 |
| özdevim Sað Açýklýk: | -3.9 |
| özdevim Yükselim: | -7.7 |
| B-T magnitude: | 10.073 |
| V-T magnitude: | 9.87 |
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