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Hans Publishers, Astronomy & Astrophysics, 3(390), p. 917-929

DOI: 10.1051/0004-6361:20020334

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An inverse method to interpret colour-magnitude diagrams

Journal article published in 2002 by Jean-Luc Vergely, Joachim Koeppen, J. K�ppen, J. Köppen, Daniel Egret ORCID, Olivier Bienaymé, O. Bienaym�
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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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. Comment: 14 pages, 11 figures. To be published in Astronomy & Astrophysics