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Bayesian isochrone fitting and stellar ages

Published online by Cambridge University Press:  14 November 2014

D. Valls-Gabaud
D. Valls-Gabaud*
Affiliation:
LERMA, CNRS UMR 8112, Observatoire de Paris, 61 avenue de l'Observatoire, 75014 Paris, France
*
e-mail: david.valls-gabaud@obspm.fr
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Abstract

Stellar evolution theory has been extraordinarily successful at explaining the different phases under which stars form, evolve and die. While the strongest constraints have traditionally come from binary stars, the advent of asteroseismology is bringing unique measures in well-characterised stars. For stellar populations in general, however, only photometric measures are usually available, and the comparison with the predictions of stellar evolution theory have mostly been qualitative. For instance, the geometrical shapes of isochrones have been used to infer ages of coeval populations, but without any proper statistical basis. In this chapter we provide a pedagogical review on a Bayesian formalism to make quantitative inferences on the properties of single, binary and small ensembles of stars, including unresolved populations. As an example, we show how stellar evolution theory can be used in a rigorous way as a prior information to measure the ages of stars between the Zero Age Main Sequence and the Helium flash, and their uncertainties, using photometric data only.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 65: The Ages of Stars , 2014 , pp. 225 - 265
Copyright
© EAS, EDP Sciences, 2014

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