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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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Membro dei seguenti gruppi:
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Osservazione e dati astrometrici
| Costellazione: | Delfino |
| Ascensione retta: | 20h51m09.87s |
| Declinazione: | +08°50'09.2" |
| Magnitudine apparente: | 9.399 |
| Moto proprio RA: | -31.6 |
| Moto proprio Dec: | -30.8 |
| B-T magnitude: | 9.635 |
| V-T magnitude: | 9.419 |
Cataloghi e designazioni:
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