Physics
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.576..521h&link_type=abstract
"Proceedings of the Gaia Symposium "The Three-Dimensional Universe with Gaia" (ESA SP-576). Held at the Observatoire de Paris-Me
Physics
3
Metallicity, Age, Galactic Disc
Scientific paper
Disc stars will represent the vast majority of objects in the Gaia Catalogue. For several tens of millions of F and G type stars, parallaxes and multi-colour photometry will permit the determination of age and metallicity to good accuracy. I illustrate the present level of our knowledge on ages and metallicities of disc stars in the solar neighbourhood, and discuss their properties from available data. Looking in retrospect to what has been achieved with Hipparcos data on field stars, we know that an important source of uncertainty in the determination of ages are the atmospheric parameters. I show how systematic biases on these parameters affect the determination of evolutionary patterns such as the age-metallicity distribution, and look for possible implications for Gaia.
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