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Metallicism among A and F giant stars
132 stars considered as A and F giants have been studied for theirproperties in the Geneva photometric system. It is shown that thissystem to derive the temperature, absolute magnitude and Fe/H value forstars in this part of the HR diagram. 36 percent of the stars of oursample exhibit an enhanced value Delta m2 that can be interpreted interms of Fe/H. The red limit of stars having an enhanced Fe/H value is0.225 in B2-V1 or 6500 K in Teff. This corresponds to the limit definedby Vauclair and Vauclair (1982) where the diffusion timescale is equalto the stellar lifetime and permits the assumption that the diffusion isthe process responsible for the metallicism observed in the A and Fgiants.
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Osservazione e dati astrometrici
| Costellazione: | Idra |
| Ascensione retta: | 09h31m42.58s |
| Declinazione: | +06°13'20.9" |
| Magnitudine apparente: | 9.265 |
| Moto proprio RA: | -16.7 |
| Moto proprio Dec: | -23.4 |
| B-T magnitude: | 9.906 |
| V-T magnitude: | 9.318 |
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