EAS Publications Series
Volume 65, 2014The Ages of Stars
|Page(s)||225 - 265|
|Published online||14 November 2014|
Y. Lebreton, D. Valls-Gabaud and C. Charbonnel (eds)
EAS Publications Series, 65 (2014) 225-265
Bayesian isochrone fitting and stellar ages
LERMA, CNRS UMR 8112, Observatoire de Paris, 61 avenue de l'Observatoire, 75014 Paris, France
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.
© EAS, EDP Sciences, 2014
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.