The Geneva-Copenhagen Survey of the Solar Neighbourhood

Research output: Contribution to journalArticle


We report on a new survey of metallicities, ages, and Galactic orbitsfor a complete, magnitude-limited, and kinematically unbiased all-skysample of 16682 nearby F- and G-dwarfs. Our~63000 new, accurate radialvelocities for nearly 13500 of the stars, combined with Hipparcosparallaxes and Tycho-2 proper motions, complete the kinematic data for14139 stars and allow us to identify most of the binary stars in thesample. Isochrone ages have been determined whenever reliable resultsare possible, with particular attention to realistic error estimates.Among the basic properties of the Galactic disk that can bereinvestigated from our data are the metallicity distribution ofG-dwarfs and the age-metallicity and age-velocity relations of the solarneighbourhood. We confirm the lack of metal-poor G-dwarfs relative toclassical model predictions (the `G-dwarf problem'), the near-constancyof the mean metallicity since the formation of the thin disk, and theappearance of the kinematic signature of the thick disk ~ 10Gyr ago.


  • Birgitta Nordström
  • J. Andersen
  • J. Holmberg
  • Bjarne Rosenkilde Jørgensen
  • M. Mayor
  • F. Pont
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Astronomy, Astrophysics and Cosmology


  • Galaxy: solar neighbourhood, Galaxy: disk, Galaxy: kinematics and dynamics, Galaxy: evolution
Original languageEnglish
Pages (from-to)129-133
JournalPublications Astronomical Society of Australia
Issue number2
Publication statusPublished - 2004
Publication categoryResearch