Computer Science
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.576..187p&link_type=abstract
"Proceedings of the Gaia Symposium "The Three-Dimensional Universe with Gaia" (ESA SP-576). Held at the Observatoire de Paris-Me
Computer Science
3
Methods Statistical, Stars Evolution, Stars Fundamental Parameters, Hertzsprung-Russell (Hr) Diagram, Galaxy Evolution
Scientific paper
Computing ages from theoretical isochrones for large numbers of field dwarfs is becoming standard practice to study the history of the Galaxy from the solar neighbourhood record. Ages are usually read off the nearest model isochrone in parameter space. In the wake of the publication of the Geneva-Copenhagen Solar Neighbourhood Survey, we have reconsidered the isochrone age method. We find that isochrone ages for field dwarfs are subject to enormous systematic biases, and simple analysis methods e.g., scatter plots, are not appropriate. More evolved statistical treatments are essential for meaningful results (Bayesian estimates, inverse approach).
Eyer Laurent
Pont Frederic
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