An inverse method to interpret colour-magnitude diagrams

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.

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

References in corpus (2)

• Numerical Methods of Star Formation History Measurement and Applications to Seven Dwarf Spheroidals
• A Method for Determining the Star Formation History of a Mixed Stellar Population

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