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A&A 390, 917-929 (2002)
DOI: 10.1051/0004-6361:20020334
An inverse method to interpret colour-magnitude diagrams
J.-L. Vergely1, J. Köppen1, 2, 3, D. Egret1 and O. Bienaymé11 Observatoire Astronomique de Strasbourg, UMR 7550, Université Louis Pasteur, 67000 Strasbourg, France
2 Institut für Theoretische Physik und Astrophysik der Universität, 24098 Kiel, Germany
3 International Space University, Parc d'Innovation, 67400 Illkirch, France
(Received 13 November 2000 / Accepted 20 February 2002)
Abstract
An inverse method is developed to determine the star formation
history, the age-metallicity relation, and the IMF slope from
a colour-magnitude diagram.
The method is applied to the Hipparcos HR diagram. We found
that the thin disk of our Galaxy shows
a peak of stellar formation 1.6 Gyr ago. The stars close to the Sun
have a solar metallicity and a mean IMF index equal to
3.2. However, the model and the evolutionary tracks do not
correctly reproduce the horizontal giant branch.
Key words: methods: statistical -- stars: formation -- stars: luminosity function, mass function -- galaxy: formation
Offprint request: D. Egret, Daniel.Egret@astro.u-strasbg.fr
© ESO 2002
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