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Photoelectric Vilnius Photometry of Hipparcos Turn-Off Region Stars
Seven-color photometry in the Vilnius system and photometricclassification in terms of spectral type, absolute magnitude andmetallicity are presented for 145 Hipparcos stars of the turn-offregion, most of which have parallaxes determined to an accuracy of atleast 15%. The stars selected for the observing program included thoseidentified kinematically as intermediate between the thin disk and halo,plus a number of weak-lined stars discovered previously from objectiveprism surveys. The metallicity distribution we find for a kinematicallydefined sample of possible members of the thick disk has a meanabundance [Fe/H]= --0.3 dex and a dispersion of 0.3 dex. Our data seemto suggest a large age for this intermediate population.
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Osservazione e dati astrometrici
| Costellazione: | Ercole |
| Ascensione retta: | 17h22m05.04s |
| Declinazione: | +31°59'14.9" |
| Magnitudine apparente: | 8.232 |
| Distanza: | 94.251 parsec |
| Moto proprio RA: | -11.1 |
| Moto proprio Dec: | 42 |
| B-T magnitude: | 8.869 |
| V-T magnitude: | 8.285 |
Cataloghi e designazioni:
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