The Geneva-Copenhagen survey of the Solar neighbourhood II

摘要: Context. Ages, metallicities, space velocities, and Galactic orbits of stars in the Solar neighbourhood are fundamental observational constraints on models galactic disk evolution. Understanding minimising systematic errors sample selection biases data is crucial for their interpretation. Aims. We aim to consolidate calibrations uvbyβ photometry into T eff , [Fe/H], distance, age F G rediscuss results Geneva-Copenhagen Survey (Nordstrom et al. 2004; GCS) terms evolution disk. Methods. use recent V - K photometry, angular diameters, high-resolution spectroscopy, Hipparcos parallaxes, extensive numerical simulations re-examine verify temperature, metallicity, reddening uvby/3 system. also highlight effects inherent apparent-magnitude limited GCS sample. Results. substantially improve [Fe/H] early stars, where spectroscopic temperatures have large errors. A slight offset non-standard helium abundance Hyades invalidate its checking metallicity or scales; however, distances, reddenings, scale field require minor corrections only. Our recomputed ages excellent agreement with independent determinations by Takeda (2007), indicating that isochrone can now be reliably determined. Conclusions. The revised G-dwarf distribution remains incompatible closed-box models, age-metallicity relation thin almost flat, real scatter at all (σ intrinsic = 0.20 dex). Dynamical heating continues throughout life; specific in-plane dynamical dominate U while W velocities remain random ages. When assigning thick thin-disk membership from kinematic criteria, parameters oldest should used characterise